Fix wrong commit count in push event payload

Closes #49971

See merge request gitlab-org/gitlab-ce!21338

This fixes a regression in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/20916.
We now only use the full commit count for the initial push to the default branch.
Otherwise, we rely on the number of commits that we calculated occurred in the push.

The original behavior in 11.1.4:

1. When a new branch is pushed, `@push_commits_count` was set to the total
number of refs available for the branch.
2. For other branches, `@push_commits_count` would remain `nil`.
3. `GitPushService#build_push_data` would build the push data with
`@push_commits_count`.
4. If this were `nil`, it would be set to the right value here:
https://gitlab.com/gitlab-org/gitlab-ce/blob/v11.1.4/lib/gitlab/data_builder/push.rb#L60

Broken behavior:

1. `GitPushService#push_commits_count` is always called.
2. The total number of commits is therefore always equal to the total number of refs available.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/49971

Improve system hook spec in spec/services/git_push_service_spec.rb

See merge request gitlab-org/gitlab-ce!21347

Update gitlab-svgs to 1.2.8

See merge request gitlab-org/gitlab-ce!21346

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Eliminate unnecessary and duplicate system hook fires

Closes #50549

See merge request gitlab-org/gitlab-ce!21337

Added store for file templates in the Web IDE

See merge request gitlab-org/gitlab-ce!21272

[QA] Fix a 'superclass must be a Class' error

Closes gitlab-qa#317

See merge request gitlab-org/gitlab-ce!21340

Avoid nil safe message

See merge request gitlab-org/gitlab-ce!21326

Bump fog-google to 1.7.1 and google-api-client to 0.23.0

See merge request gitlab-org/gitlab-ce!21295

Resolve "Cherry-picking: Confirmation message should include target branch name"

Closes #41441

See merge request gitlab-org/gitlab-ce!20846

API: Catch empty commit messages

Closes #50268, #50266, and #50265

See merge request gitlab-org/gitlab-ce!21322

Api empty project snippets

Closes #50270

See merge request gitlab-org/gitlab-ce!21325

API: Add shared project's expiration date

Closes #46107

See merge request gitlab-org/gitlab-ce!21104

Signed-off-by: Rémy Coutable <remy@rymai.me>

[ci skip]

Docs update ha aws diagram

See merge request gitlab-org/gitlab-ce!21321

Fix SQL error when sorting 2FA-enabled users by name in admin area

See merge request gitlab-org/gitlab-ce!21324

Remove another batch of reassigned scss variables

See merge request gitlab-org/gitlab-ce!21334

This is needed to support query parameters in `Fog::Storage::Google`.
See https://github.com/fog/fog-google/pull/409.

Relates to https://gitlab.com/gitlab-org/gitlab-ce/issues/49957

Previously `SystemHookPushWorker` would always be called after a push event,
and this would queue a Sidekiq job regardless of whether any system hooks
needed that event. Moreover, another call inside `Project#execute_hooks` would
also fire system hooks if they existed.

This change both removes the duplicate system hook calls. For installations
without system hooks for push events, this change also can save significant
amount of RAM used by Redis.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/50549

Don't use arguments keyword in gettext script

Closes #50457

See merge request gitlab-org/gitlab-ce!21296

Moves spec files for job log components into components folder

See merge request gitlab-org/gitlab-ce!21303

Resolve "Download artifacts button not available on mobile"

Closes #50524

See merge request gitlab-org/gitlab-ce!21332

Update `gitlab` chart docs for GA

See merge request gitlab-org/gitlab-ce!21215

Allow project owners to set up forking relation through API

Closes #40550

See merge request gitlab-org/gitlab-ce!18104

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>