Make all Gitlab::Git exceptions inherit from Gitlab::Git::BaseError

BaseError sanitizes `debug_error_string`, which we do to avoid
leaking details to the user and polluting Sentry.

This inheritance means code that rescues `Gitlab::Git::BaseError` needs
to rescue `Gitlab::Git::Repository::NoRepository` earlier.

ee/app/services/geo/design_repository_sync_service.rb

@@ -10,18 +10,18 @@ module Geo
       start_registry_sync!
       fetch_repository
       mark_sync_as_successful
+    rescue Gitlab::Git::Repository::NoRepository => e
+      log_info('Marking the design repository for a forced re-download')
+      fail_registry_sync!('Invalid design repository', e, force_to_redownload: true)
     rescue Gitlab::Shell::Error, Gitlab::Git::BaseError => e
       # In some cases repository does not exist, the only way to know about this is to parse the error text.
       # If it does not exist we should consider it as successfully downloaded.
-      if e.message.include? Gitlab::GitAccess::ERROR_MESSAGES[:no_repo]
+      if e.message.include? Gitlab::GitAccess::ERROR_MESSAGES[:no_repo] # rubocop:disable Cop/LineBreakAroundConditionalBlock
         log_info('Design repository is not found, marking it as successfully synced')
         mark_sync_as_successful(missing_on_primary: true)
       else
         fail_registry_sync!('Error syncing design repository', e)
       end
-    rescue Gitlab::Git::Repository::NoRepository => e
-      log_info('Marking the design repository for a forced re-download')
-      fail_registry_sync!('Invalid design repository', e, force_to_redownload: true)
     ensure
       expire_repository_caches
     end

ee/app/services/geo/repository_sync_service.rb

@@ -11,9 +11,15 @@ module Geo
       fetch_repository
       update_root_ref
       mark_sync_as_successful
+    rescue Gitlab::Git::Repository::NoRepository => e
+      log_info('Setting force_to_redownload flag')
+      fail_registry_sync!('Invalid repository', e, force_to_redownload_repository: true)
+
+      log_info('Expiring caches')
+      project.repository.after_create
     rescue Gitlab::Shell::Error, Gitlab::Git::BaseError => e
       # In some cases repository does not exist, the only way to know about this is to parse the error text.
-      if e.message.include? Gitlab::GitAccess::ERROR_MESSAGES[:no_repo]
+      if e.message.include? Gitlab::GitAccess::ERROR_MESSAGES[:no_repo] # rubocop:disable Cop/LineBreakAroundConditionalBlock
         if repository_presumably_exists_on_primary?
           log_info('Repository is not found, but it seems to exist on the primary')
           fail_registry_sync!('Repository is not found', e)
@@ -24,12 +30,6 @@ module Geo
       else
         fail_registry_sync!('Error syncing repository', e)
       end
-    rescue Gitlab::Git::Repository::NoRepository => e
-      log_info('Setting force_to_redownload flag')
-      fail_registry_sync!('Invalid repository', e, force_to_redownload_repository: true)
-
-      log_info('Expiring caches')
-      project.repository.after_create
     ensure
       expire_repository_caches
       execute_housekeeping

ee/app/services/geo/wiki_sync_service.rb

@@ -10,10 +10,13 @@ module Geo
       start_registry_sync!
       fetch_repository
       mark_sync_as_successful
+    rescue Gitlab::Git::Repository::NoRepository => e
+      log_info('Setting force_to_redownload flag')
+      fail_registry_sync!('Invalid wiki', e, force_to_redownload_wiki: true)
     rescue Gitlab::Shell::Error, Gitlab::Git::BaseError, Wiki::CouldNotCreateWikiError => e
       # In some cases repository does not exist, the only way to know about this is to parse the error text.
       # If it does not exist we should consider it as successfully downloaded.
-      if e.message.include? Gitlab::GitAccess::ERROR_MESSAGES[:no_repo]
+      if e.message.include? Gitlab::GitAccess::ERROR_MESSAGES[:no_repo] # rubocop:disable Cop/LineBreakAroundConditionalBlock
         if repository_presumably_exists_on_primary?
           log_info('Wiki is not found, but it seems to exist on the primary')
           fail_registry_sync!('Wiki is not found', e)
@@ -24,9 +27,6 @@ module Geo
       else
         fail_registry_sync!('Error syncing wiki repository', e)
       end
-    rescue Gitlab::Git::Repository::NoRepository => e
-      log_info('Setting force_to_redownload flag')
-      fail_registry_sync!('Invalid wiki', e, force_to_redownload_wiki: true)
     ensure
       expire_repository_caches
     end

lib/gitlab/git/repository.rb

@@ -19,15 +19,15 @@ module Gitlab
       GITLAB_PROJECTS_TIMEOUT = Gitlab.config.gitlab_shell.git_timeout
       EMPTY_REPOSITORY_CHECKSUM = '0000000000000000000000000000000000000000'
 
-      NoRepository = Class.new(StandardError)
-      InvalidRepository = Class.new(StandardError)
-      InvalidBlobName = Class.new(StandardError)
-      InvalidRef = Class.new(StandardError)
-      GitError = Class.new(StandardError)
-      DeleteBranchError = Class.new(StandardError)
-      TagExistsError = Class.new(StandardError)
-      ChecksumError = Class.new(StandardError)
-      class CreateTreeError < StandardError
+      NoRepository = Class.new(::Gitlab::Git::BaseError)
+      InvalidRepository = Class.new(::Gitlab::Git::BaseError)
+      InvalidBlobName = Class.new(::Gitlab::Git::BaseError)
+      InvalidRef = Class.new(::Gitlab::Git::BaseError)
+      GitError = Class.new(::Gitlab::Git::BaseError)
+      DeleteBranchError = Class.new(::Gitlab::Git::BaseError)
+      TagExistsError = Class.new(::Gitlab::Git::BaseError)
+      ChecksumError = Class.new(::Gitlab::Git::BaseError)
+      class CreateTreeError < ::Gitlab::Git::BaseError
         attr_reader :error_code
 
         def initialize(error_code)