Upgrade GitLab QA image to Ruby 2.5

See merge request gitlab-org/gitlab-ce!24091

Remove gem install bundler from Docker-based Ruby environments

Closes #55838

See merge request gitlab-org/gitlab-ce!24093

log text_filter arg of find_element

Closes gitlab-org/quality/nightly#52

See merge request gitlab-org/gitlab-ce!24064

Updating link to correctly point to environment scope docs

See merge request gitlab-org/gitlab-ce!24023

Update mysql.md - broken link

See merge request gitlab-org/gitlab-ce!23988

Explain how to use kaniko with a registry with a custom certificate

Closes #53656

See merge request gitlab-org/gitlab-ce!23875

[master] Adds validation to check if user can read project

See merge request gitlab/gitlabhq!2645

[master] Validate projects in MR build service

See merge request gitlab/gitlabhq!2678

[master] Project guests no longer are able to see refs page

See merge request gitlab/gitlabhq!2685

[master] SSRF - Scan Internal Ports and GCP/AWS endpoints

See merge request gitlab/gitlabhq!2689

[master] Prevent private snippet from being embeddable

See merge request gitlab/gitlabhq!2692

[master] Escape label and milestone titles to prevent XSS in GFM autocomplete

See merge request gitlab/gitlabhq!2693

[master] Guest users have access to all Job information via the API

See merge request gitlab/gitlabhq!2717

[master] SSRF in project imports with LFS

See merge request gitlab/gitlabhq!2720

[master] Group Ex-Maintainer Could maintain Access to Project's Source Code/Jobs/Pipelines/Artifacts if it had Shared Group Runner Configured

See merge request gitlab/gitlabhq!2721

bundler gem has been included in the Docker official Ruby image since 2.1.
Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Fix #55740:  Use the '--no-document' option instead of the 'gem' tool's deprecated options

Closes #55740

See merge request gitlab-org/gitlab-ce!24049

Fix commit SHA not showing in merge request compare dropdown

Closes #55822

See merge request gitlab-org/gitlab-ce!24084

Upgrade Omniauth and JWT gems to switch away from Google+ API

Closes #55668

See merge request gitlab-org/gitlab-ce!24068

`--no-rdoc` and `--no-ri` have been deprecated since RubyGems 2.0:
https://github.com/rubygems/rubygems/blob/v2.0.0/History.txt#L43

They were finally removed in a recent release:
https://github.com/rubygems/rubygems/pull/2354

GitLab is now shipping with Ruby 2.5.3, so we should make the
version consistent for the QA image as well.