This helps with queries that get project ids based on the - comparably
rare - visibility levels 10 and 20. For these, postgres can now leverage
the partial index for a index-only scan to improve performance.

Example queries:
SELECT id FROM projects WHERE visibility_level IN (10,20)
SELECT id FROM projects WHERE visibility_level IN (10)

For MySQL, this results in a full index on id because MySQL omits the
WHERE clause. That is, the index is a duplicate of the primary key
basically.

Move spinach project network graph tests to RSpec

See merge request gitlab-org/gitlab-ce!17171

Remove unecessary validate: true from belongs_to :project

See merge request gitlab-org/gitlab-ce!17166

Remove graphs_show.js webpack bundle

See merge request gitlab-org/gitlab-ce!17194

This does not seem to serve any clear purpose and causes other issues (see https://gitlab.com/gitlab-org/gitlab-ce/issues/43196#note_59275652)

Remove extraneous tests from Issues API spec

Closes #25201

See merge request gitlab-org/gitlab-ce!17222

Update two links in the changelog developer docs

See merge request gitlab-org/gitlab-ce!17220

Chart.html.haml refactor

See merge request gitlab-org/gitlab-ce!16897

These were all testing an implementation detail of
`Issues::UpdateService` which is already well-tested and doesn't need to
be re-tested here.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/25201

[GH Import] Create an empty wiki if wiki import failed

Closes #43020

See merge request gitlab-org/gitlab-ce!17112

Resolve "group request membership mail with too long list of "To:""

Closes #42274

See merge request gitlab-org/gitlab-ce!17121

Fix single digit value clipping for stacked progress bar

Closes gitlab-ee#4864

See merge request gitlab-org/gitlab-ce!17217

Avoid slow File Lock checks when not used

Closes #43339

See merge request gitlab-org/gitlab-ce!17140

Increase feature flag cache TTL to one hour

Closes #40854

See merge request gitlab-org/gitlab-ce!17213

Fix and simplify end-to-end tests for secret variables

Closes gitlab-qa#190

See merge request gitlab-org/gitlab-ce!17173

Flipper already takes care of flushing cache entries when
enabling/disabling features so it should be safe to increase the TTL.
This in turn should drastically reduce the number of Flipper queries
executed.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/40854

Resolve "Double closing system  notes when closing issue with Merge Request"

Closes #32546 and #32564

See merge request gitlab-org/gitlab-ce!17035

Don't attempt to update user tracked fields if database is in read-only

Closes gitlab-ee#4972

See merge request gitlab-org/gitlab-ce!17200

The tracking issue if this causes problems is
https://gitlab.com/gitlab-org/gitaly/issues/1028

Docs: Update all articles with the new layout (metadata from the frontmatter)

Closes #42831

See merge request gitlab-org/gitlab-ce!17187

Fix squash rebase not working when diff contained encoded data

Closes gitlab-ee#4960

See merge request gitlab-org/gitlab-ce!17205

[ci skip]

Also avoid double commit lookup during file lock check by reusing
memoized commits.

Backport webpack.config.js changes from EE

See merge request gitlab-org/gitlab-ce!17185

Fix Error 500 when viewing a commit with a GPG signature in Geo

Closes gitlab-ee#4825

See merge request gitlab-org/gitlab-ce!17207

Remember assignee when moving an issue

See merge request gitlab-org/gitlab-ce!17116

Sanitize extra blank spaces used when uploading a SSH key

Closes #40552

See merge request gitlab-org/gitlab-ce!17138

Closes gitlab-org/gitlab-ee#4825

When the applied diff contains UTF-8 or some other encoded data, the diff
returned back from the git process may be in ASCII-8BIT format. Writing this
data to stdin may fail if the data because stdin expects this data to be in
UTF-8. By switching the output to binmode, we ensure that the diff will
always be written as-is.

Closes gitlab-org/gitlab-ee#4960