Improve layout of Integrations page

See merge request gitlab-org/gitlab!16582

* Grouped like items together to make it easier to find an item
  in a specific category.
* Reformatted links to the respective topics.
* Restructured the 'SSL certificate errors' section.
* Added a brief introduction to each bulleted list.

Use SlotSwitch component for epics tree forms

See merge request gitlab-org/gitlab!17608

see https://gitlab.com/gitlab-org/gitlab/merge_requests/17608#note_241493589

Geo: Small refactor renaming some methods

See merge request gitlab-org/gitlab!19712

Retry visiting URL if not successful

Closes #35707

See merge request gitlab-org/gitlab!19732

Capture AWS role for creating EKS clusters

See merge request gitlab-org/gitlab!18307

Resolve "Document VPC-Native created clusters"

Closes #33783

See merge request gitlab-org/gitlab!19501

Skip redis call when IP is whitelisted

See merge request gitlab-org/gitlab!19521

Enable frozen string for spec/lib/gitlab

See merge request gitlab-org/gitlab!19746

Partially addresses:

https://gitlab.com/gitlab-org/gitlab/issues/27703

Also rename 'eks' to 'aws' to keep consistency with
the backend.

- Remove extra space in before endLink
- Remove handleAuthenticate and call createRole directly
- Call createRole as a form submission.
- Store api paths in the store state

- Make cloud provider illustrations 64px
- Set svg-content padding to 8px
- Use btn-light styles for buttons
- Include external link icon

Implement Vuex store logic to send a request to create an ARN role

Handle isAuthenticating state
Handle authentication error state

to be part of the Vuex store state

Allows to set a Role ARN to obtain access to
AWS resources from a gitlab account

- Pass server side parameters
- Decide to render service credentials form or cluster config form

Once hooked up to the Vue app, this will take care of
the first step of creating a cluster on EKS - capturing
the role GitLab will assume to create resources in the
user's account.

Adds four new options to ApplicationSetting:

* eks_integration_enabled
* eks_account_id
* eks_access_key_id
* eks_secret_access_key

:eks_account_id is exposed to the frontend to allow
users to add it as a trusted entity to their chosen
IAM role.

Refactor test to avoid flakiness

Closes #35785

See merge request gitlab-org/gitlab!19770

Revert "Merge branch 'remove-unnecessary-sql-queries-from-avatar-requests' into 'master'"

See merge request gitlab-org/gitlab!19786

GitLab.com FF statuses are logged

See merge request gitlab-org/gitlab!19769

Confirm email before ci usage

See merge request gitlab-org/gitlab!19783

Return Only Environments Not in Folders in Environment Dashboard

See merge request gitlab-org/gitlab!19538

Delete EnvironmentFolder class

Remove ES parent relation for project snippets

See merge request gitlab-org/gitlab!19715

This reverts merge request !19383

Explicit application controller for package

See merge request gitlab-org/gitlab!19755

Merge branch '19445-native-group-milestone-page-needs-same-info-as-project-milestones' into 'master'

Add tabs in group milestone page

See merge request gitlab-org/gitlab!18818

Support Create and Update operations for Feature Flag Scope API

See merge request gitlab-org/gitlab!19677

Resolve "User popover immediately closed when hovering over certain areas"

See merge request gitlab-org/gitlab!19519