added code differences from EE to CE

Closes gitlab-ee#10088

See merge request gitlab-org/gitlab-ce!29271

Remove metrics_time_window feature flag

Closes #62091

See merge request gitlab-org/gitlab-ce!28670

SSoT audit fixes for some topics in CI section

Closes #61505

See merge request gitlab-org/gitlab-ce!28957

Implements part of the single source of truth audit
fixes for the CI section.

Integrate demo link into content more

See merge request gitlab-org/gitlab-ce!29242

(CE Port) Onboarding helper component

See merge request gitlab-org/gitlab-ce!29133

- Add styles for popover
- Add $accepting-mr-label-color to color variables

Add git 2.21 install from update_source

See merge request gitlab-org/gitlab-ce!28836

Hide operations icon in small screens

See merge request gitlab-org/gitlab-ce!29230

Improve Jira Server documentation

Closes #58975

See merge request gitlab-org/gitlab-ce!28463

Fix OpenID Connect documentation

See merge request gitlab-org/gitlab-ce!29314

Make OpenID Connect work without requiring a name

Closes #62208

See merge request gitlab-org/gitlab-ce!29312

docs - add section to dev docs on accessing chatops

Closes #62127

See merge request gitlab-org/gitlab-ce!28623

closes 62127

Port missing docs to CE

See merge request gitlab-org/gitlab-ce!29279

Add docs for breaking changes of GitLab CI in 12.0

See merge request gitlab-org/gitlab-ce!29053

Visit project after push

Closes gitlab-org/quality/nightly#105

See merge request gitlab-org/gitlab-ce!29247

Removes duplicated shared_context folder on spec/support

See merge request gitlab-org/gitlab-ce!29305

Adds sidekiq worker label for ruby metrics

Closes #60303

See merge request gitlab-org/gitlab-ce!29215

Many users were unable to get logins working with OpenID Connect because
of a missing `name` argument in the configuration. This resulted in 404s
immediately after attempting to login. This describes the workaround
mentioned in
https://gitlab.com/gitlab-org/gitlab-ce/issues/62208#note_178774809.

This also adds an example profile for using Google.

If there is no name argument given, OmniAuth will try to guess the name
by the class name. In
https://github.com/omniauth/omniauth/blob/v1.9.0/lib/omniauth/strategy.rb#L139,
`OmniAuth::Strategies::OpenIDConnect` gets translated to
`openidconnect`.

This leads to an immediate 404 error after clicking the login button
because OmniAuth can't match the current route (/users/auth/openid_connect)
against the expected one (/users/auth/openidconnect).

Other providers, such as Google OAuth2, set this name as the default
option within the OmniAuth Strategy. Until a fix is merged upstream,
let's just set the parameter ourselves.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/62208

- Remove image for adding new permission scheme
- Delete jira_add_permission_scheme.png as no longer included in content
- add group language
- Reword the add user to group instructions
- Reword the add selected users instruction
- Reword add permission scheme instruction
- Update jira_server_configuration intro

Update screecaps to reflect jira version ~8.1 and update instructions
to include Permission Schemes.

Most of the shared context are located under
spec/support/shared_contexts, we only have one file under
spec/support/shared_context, this MR moves it to
spec/support/shared_contexts instead

Backport: Add frontend support for cluster health alerts

See merge request gitlab-org/gitlab-ce!29075

Adds a new query text input for metric alerts

CE backport for Storage Counter changes

Closes #59232

See merge request gitlab-org/gitlab-ce!29206

Don't fail the pipeline when a colon-emoji is used

See merge request gitlab-org/gitlab-ce!29291

Add certificate valid time to pages domain table

See merge request gitlab-org/gitlab-ce!29287

Save certificate validity time for pages domains on save
Fill validity time for existing pages domains in background migration

Add pages domains acme orders

See merge request gitlab-org/gitlab-ce!27811