Rename skip_ci field to git_push_options on rebase

Instead of passing `skip_ci` field which is Gitlab
specific notion, pass `git_push_options` to Gitaly
rebase RPC

app/models/repository.rb

@@ -1067,6 +1067,9 @@ class Repository
       return rebase_deprecated(user, merge_request)
     end
 
+    push_options = []
+    push_options << 'ci.skip' if skip_ci
+
     raw.rebase(
       user,
       merge_request.id,
@@ -1074,7 +1077,7 @@ class Repository
       branch_sha: merge_request.source_branch_sha,
       remote_repository: merge_request.target_project.repository.raw,
       remote_branch: merge_request.target_branch,
-      skip_ci: skip_ci
+      push_options: push_options
     ) do |commit_id|
       merge_request.update!(rebase_commit_sha: commit_id, merge_error: nil)
     end

lib/gitlab/git/repository.rb

@@ -853,7 +853,7 @@ module Gitlab
         end
       end
 
-      def rebase(user, rebase_id, branch:, branch_sha:, remote_repository:, remote_branch:, skip_ci: false, &block)
+      def rebase(user, rebase_id, branch:, branch_sha:, remote_repository:, remote_branch:, push_options: [], &block)
         wrapped_gitaly_errors do
           gitaly_operation_client.rebase(
             user,
@@ -862,7 +862,7 @@ module Gitlab
             branch_sha: branch_sha,
             remote_repository: remote_repository,
             remote_branch: remote_branch,
-            skip_ci: skip_ci,
+            push_options: push_options,
             &block
           )
         end

lib/gitlab/gitaly_client/operation_service.rb

@@ -233,7 +233,7 @@ module Gitlab
         end
       end
 
-      def rebase(user, rebase_id, branch:, branch_sha:, remote_repository:, remote_branch:, skip_ci: false)
+      def rebase(user, rebase_id, branch:, branch_sha:, remote_repository:, remote_branch:, push_options: [])
         request_enum = QueueEnumerator.new
         rebase_sha = nil
 
@@ -257,7 +257,7 @@ module Gitlab
               branch_sha: branch_sha,
               remote_repository: remote_repository.gitaly_repository,
               remote_branch: encode_binary(remote_branch),
-              skip_ci: skip_ci
+              git_push_options: push_options
             )
           )
         )