Improve AWS EKS troubleshooting documentation

See merge request gitlab-org/gitlab!50336

This commit adds a sequence diagram to help explain what happens when a
user attempts to create an EKS cluster. This documentation also
describes IAM instance profiles and the new error messages present in
GitLab 13.7.

Relates to:

* https://gitlab.com/gitlab-org/gitlab/-/issues/291016
* https://gitlab.com/gitlab-org/gitlab/-/issues/291015

Document pipeline fork icon

See merge request gitlab-org/gitlab!50392

Expose notes.resolved_at via api

See merge request gitlab-org/gitlab!49821

Always generate unique name for `DastSiteProfile` in specs

See merge request gitlab-org/gitlab!50361

Add experiment for pipeline empty state

See merge request gitlab-org/gitlab!47952

Change remote links from blob to raw

See merge request gitlab-org/gitlab!50316

Update SCIM header to avoid confusion

See merge request gitlab-org/gitlab!49801

Terraform Backend Doc update: Correcting the filename to .gitlab-ci.yml

See merge request gitlab-org/gitlab!50384

Track epic issues count on usage data

See merge request gitlab-org/gitlab!50204

Docs update to link out to correct epic referencing compliance pipeline configuration

See merge request gitlab-org/gitlab!50332

Fix Vulnerabilities::Finding#remediations method

See merge request gitlab-org/gitlab!50317

This adds an experiment where we change the text onthe pipeline zero
state page (when there is no pipeline created yet).

We want to know if there is an overall increase in pipeline creation,
that's why we also track the pipelines created.

Add Group Migration filtering

See merge request gitlab-org/gitlab!49963

Add resolvedById field to vulnerability object in GraphQL

See merge request gitlab-org/gitlab!50145

Delete extra line

See merge request gitlab-org/gitlab!50382

Refactor specs around ssh_keys in users_controller_spec.rb

See merge request gitlab-org/gitlab!50338

Add Pages migration service

See merge request gitlab-org/gitlab!49473

Fix documentation missing history tier in service_desk.md --> customized email templates

See merge request gitlab-org/gitlab!50320

Force multiple experiments in browser session

See merge request gitlab-org/gitlab!49373

Keep the URL query string params way

Associate subsequent jobs with triggering user

See merge request gitlab-org/gitlab!49833

When retrying builds or pipelines, all subsequent build will get
associated to the user which triggered the retry.

Update code coverage bar color to increase contrast

See merge request gitlab-org/gitlab!49724

Docs: fix linting errors in due_dates.md

See merge request gitlab-org/gitlab!49848

Add pagination test for dastSiteValidations field

See merge request gitlab-org/gitlab!49913

Skip filtering by domain if iid is given

See merge request gitlab-org/gitlab!50208

Add MergeRequest.reviewers

See merge request gitlab-org/gitlab!49707

Fix operations on destroyed wrappers

See merge request gitlab-org/gitlab!50098

Fix Redis HLL weekly keys

See merge request gitlab-org/gitlab!50358