Don't execute git hooks if you create branch as part of other change

Currently, our procedure for adding a commit requires us to execute `CreateBranchService` before file creation.
It's OK, but also we do execute `git hooks` (the `PostReceive` sidekiq job) as part of this process.
However, this hook is execute before the file is actually committed, so the ref is updated.

Secondly, we do execute a `git hooks` after committing file and updating ref.
This results in duplicate `PostReceive` jobs, where the first one is completely invalid.

This change makes the branch creation, something that is intermediate step of bigger process (file creation or update, commit cherry pick or revert) to not execute git hooks.

app/models/repository.rb

@@ -160,14 +160,18 @@ class Repository
     tags.find { |tag| tag.name == name }
   end
 
-  def add_branch(user, branch_name, target)
+  def add_branch(user, branch_name, target, with_hooks: true)
     oldrev = Gitlab::Git::BLANK_SHA
     ref    = Gitlab::Git::BRANCH_REF_PREFIX + branch_name
     target = commit(target).try(:id)
 
     return false unless target
 
-    GitHooksService.new.execute(user, path_to_repo, oldrev, target, ref) do
+    if with_hooks
+      GitHooksService.new.execute(user, path_to_repo, oldrev, target, ref) do
+        update_ref!(ref, target, oldrev)
+      end
+    else
       update_ref!(ref, target, oldrev)
     end
 

app/services/commits/change_service.rb

@@ -55,7 +55,7 @@ module Commits
       return success if repository.find_branch(new_branch)
 
       result = CreateBranchService.new(@project, current_user)
-                                  .execute(new_branch, @target_branch, source_project: @source_project)
+                                  .execute(new_branch, @target_branch, source_project: @source_project, with_hooks: false)
 
       if result[:status] == :error
         raise ChangeError, "There was an error creating the source branch: #{result[:message]}"

app/services/create_branch_service.rb

 require_relative 'base_service'
 
 class CreateBranchService < BaseService
-  def execute(branch_name, ref, source_project: @project)
+  def execute(branch_name, ref, source_project: @project, with_hooks: true)
     valid_branch = Gitlab::GitRefValidator.validate(branch_name)
 
     unless valid_branch
@@ -26,7 +26,7 @@ class CreateBranchService < BaseService
 
                    repository.find_branch(branch_name)
                  else
-                   repository.add_branch(current_user, branch_name, ref)
+                   repository.add_branch(current_user, branch_name, ref, with_hooks: with_hooks)
                  end
 
     if new_branch

app/services/files/base_service.rb

@@ -74,7 +74,7 @@ module Files
     end
 
     def create_target_branch
-      result = CreateBranchService.new(project, current_user).execute(@target_branch, @source_branch, source_project: @source_project)
+      result = CreateBranchService.new(project, current_user).execute(@target_branch, @source_branch, source_project: @source_project, with_hooks: false)
 
       unless result[:status] == :success
         raise_error("Something went wrong when we tried to create #{@target_branch} for you: #{result[:message]}")