Switch to DockerHub for Elasticsearch image

See merge request gitlab-org/gitlab!21750

Changelog entries for MRs 21524 and 21607

See merge request gitlab-org/gitlab!21768

Skip updating LFS objects in mirror updates if repository has not changed

Closes #38256

See merge request gitlab-org/gitlab!21744

We were being rate-limited by docker.elastic.co:

```
Unavailable: Back-end server is at capacity (executor_docker.go:188:0s)
elasticsearch : 5.6.12
```

[ci skip]

[ci skip]

UI improvements in the views for new project from template and the user groups and snippets

Closes #39469 and #39465

See merge request gitlab-org/gitlab!21524

Permissions for vulnerabilities

See merge request gitlab-org/gitlab!21265

Sort Sentry error list by first seen, last seen or frequency

See merge request gitlab-org/gitlab!21250

Added sort control, remove View in Sentry, updated tests

Add example of .gitlab-ci.yml that uses only: [merge_requests] and excludes specific branches

Closes #33573

See merge request gitlab-org/gitlab!21572

Set up basic Vue app + GraphQL + Apollo

See merge request gitlab-org/gitlab!21600

The basic Vue application with support for GraphQL and Apollo

The GetAllLFSPointers RPC is expensive and was being called for every
mirror. If the repository has not changed, we can assume that the LFS
pointers also did not change. We can skip calling this RPC if there are
no updates.

Since we don't actually get a return code if branches or tags were
updated, we use the repository checksum as a cheaper mechanism (which
XORs the ref contents) to determine whether we run the LFS scan.

Closes https://gitlab.com/gitlab-org/gitlab/issues/38256

Updates background migration docs

See merge request gitlab-org/gitlab!21354

Modifies background migrationbs docs to indicate:

* Other possible scenarios in which they might be used
* That estimation time should be included somewhere

Resolve "API Dependency List - usage ping"

See merge request gitlab-org/gitlab!21664

Fix logs menu active state

See merge request gitlab-org/gitlab!21740

Compress image and update filename

Closes #55251

See merge request gitlab-org/gitlab!21723

Remove feature flag for new trial sign up flow

See merge request gitlab-org/gitlab!21650

Move rest of boards_store_spec to Jest

Closes #39128

See merge request gitlab-org/gitlab!21694

Resolve "Allow filtering for project-specific members in group members list"

See merge request gitlab-org/gitlab!18842

This commit introduces dropdown options for project/subgroup to hide
inherited members

Wait for elasticsearch server before searching

Closes #43732

See merge request gitlab-org/gitlab!21711

Update page object method name

Closes #43319

See merge request gitlab-org/gitlab!21701

Also moves the data parts of the mock_data

**Why?**
https://gitlab.com/gitlab-org/gitlab/merge_requests/16336

Add setUrlParams utility

See merge request gitlab-org/gitlab!21729

Fix analytics icon alignment

See merge request gitlab-org/gitlab!21555

Clean up PostgreSQL Exporter documentation page

Closes #38292

See merge request gitlab-org/gitlab!21420

Per https://docs.gitlab.com/ee/development/documentation/styleguide.html#links

Bring CE->EE source upgrade instructions up to par

Closes gitlab-com/support/docs#45

See merge request gitlab-org/gitlab!21716

- This utility adds new query params,
updates existing params with a new value
and removes params with value null/undefined

Update documentation of gradle support in dependency scanning

Closes #13075

See merge request gitlab-org/gitlab!21253