Replace the `project/commits/branches.feature` spinach test with an rspec analog

See merge request gitlab-org/gitlab-ce!18302

Resolve "When editing a comment in an issue, the preview mode is toggled in the main textarea"

Closes #44697

See merge request gitlab-org/gitlab-ce!18303

Branch with a commit detection defaults to Gitaly

See merge request gitlab-org/gitlab-ce!18304

Tag with a commit detection defaults to Gitaly

See merge request gitlab-org/gitlab-ce!18305

Fix file-specific variables collection item option

Closes gitlab-ee#5444

See merge request gitlab-org/gitlab-ce!18307

Fixed markdown preview in IDE not working for new files

See merge request gitlab-org/gitlab-ce!18287

[Rails5] Fix admin/application_settings_controller

See merge request gitlab-org/gitlab-ce!18275

By default this was an OPT_IN RPC, and now graduates to OPT_OUT as the
acceptance testing was successful in:
gitaly#1009

This follows the conventions of our [migration
process](https://gitlab.com/gitlab-org/gitaly/blob/master/doc/MIGRATION_PROCESS.md)

By default this was an OPT_IN RPC, and now graduates to OPT_OUT as the
acceptance testing was successful in:
https://gitlab.com/gitlab-org/gitaly/issues/1008

This follows the conventions of our [migration
process](https://gitlab.com/gitlab-org/gitaly/blob/master/doc/MIGRATION_PROCESS.md)

[CE Backport] Fix email handler spec for EE

See merge request gitlab-org/gitlab-ce!18298

The `RAILS5=1 rspec spec/controllers/admin/application_settings_controller_spec.rb`
command throws the error:

Failures:

  1) Admin::ApplicationSettingsController PUT #update falls back to defaults when settings are omitted
      Failure/Error: import_sources = params[:application_setting][:import_sources]

      NoMethodError:
        undefined method `[]' for nil:NilClass
      # ./app/controllers/admin/application_settings_controller.rb:62:in `application_setting_params'

This commit fixes it.

Fix enviroments seeding on certain branch names

Closes #45051

See merge request gitlab-org/gitlab-ce!18263

Update vendored .gitlab-ci.yml for Auto-Devops

See merge request gitlab-org/gitlab-ce!18289

Use axios in the stage component

See merge request gitlab-org/gitlab-ce!18286

Make sure hooks run when seeding admin user

Closes gitlab-development-kit#335

See merge request gitlab-org/gitlab-ce!18284

[Rails5] Fix running spinach tests

See merge request gitlab-org/gitlab-ce!18281

Reduce complexity of issuable finder query.

Closes #37125

See merge request gitlab-org/gitlab-ce!18219

Update Security Products jobs definitions

See merge request gitlab-org/gitlab-ce!18265

1. Add support for `RAILS5=1|true` for the `bin/spinach` command.
2. Synchronize used spinach versions both for rails4 and rails5.

For rails5 it was accidently used spinach 0.10.1 instead of 0.8.10.
That brought some problems on running spinach tests.

Example of failure message:

NoMethodError: undefined method `line' for #<Spinach::Scenario:0x000000000c86ba80>
Did you mean?  lines
  /builds/gitlab-org/gitlab-ce/features/support/env.rb:52:in `before_scenario_run'

Revert "Merge branch 'improve-jobs-queuing-time-metric' into 'master'"

See merge request gitlab-org/gitlab-ce!18276

This reverts merge request !17730

Replace vue resource with axios for pipelines table

See merge request gitlab-org/gitlab-ce!18264

Document process for new Git features

See merge request gitlab-org/gitlab-ce!18230

Use Gitaly 0.95.0

See merge request gitlab-org/gitlab-ce!18256

Verify that deploy token has valid access when pulling container registry image

Closes #45148

See merge request gitlab-org/gitlab-ce!18260

Bit of a cryptic commit title, but our seeding will try to guard against
branchnames being anything but alphanumerical. These charachters we gsub
away but can't have an empty string as replacement.

This change is less efficient, but given that the number of seeded MRs
per project is very limited, this should be ok.

Migrate features/project/project.feature to RSpec and reorganize several Project feature specs

See merge request gitlab-org/gitlab-ce!18223