Prior to this commit we would essentially update all rows in a table,
even those where the source column (e.g. `issues.closed_at`) was NULL.
This in turn could lead to statement timeouts when using the default
batch size of 10 000 rows per job.

To work around this we don't schedule jobs for rows where the source
value is NULL. We also don't update rows where the source column is NULL
(as an extra precaution) or the target column already has a non-NULL
value. Using this approach it should be possible to update 10 000 rows
in the "issues" table in about 7.5 - 8 seconds.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/42158

Fix Mermaid drawings not loading on some browsers

Closes #42052

See merge request gitlab-org/gitlab-ce!16537

System hooks for Merge Requests

See merge request gitlab-org/gitlab-ce!14387

Fix the user-agent detail API endpoint for project snippets

Closes #42129

See merge request gitlab-org/gitlab-ce!16521

Add modal for stopping jobs in admin area

Closes #41305

See merge request gitlab-org/gitlab-ce!16283

Update ConvDev Index docs w better screenshot

See merge request gitlab-org/gitlab-ce!16533

Add openSUSE to the supported Unix OS list

See merge request gitlab-org/gitlab-ce!16544

Remove a broken link in the docs

See merge request gitlab-org/gitlab-ce!16532

Add the :migration metadata, and don't use factories in FixWronglyRenamedRoutes spec

See merge request gitlab-org/gitlab-ce!16535

Resolve "Cannot filter issues by labels ending with a plus char in board view"

Closes #41715 and #34252

See merge request gitlab-org/gitlab-ce!16490

As mentioned in https://github.com/knsv/mermaid/issues/291#issuecomment-287673609, the
parameter should be `startOnLoad` instead of `loadOnStart`. In addition, `mermaid.initialize()`
expects to see `startOnLoad` in the `mermaid` hash:

https://github.com/knsv/mermaid/blob/6cd5ffe637d88525b93417bf3954e9c0e5a4deb8/src/mermaid.js#L118

Closes #42052

Remove unused CSS selectors for Cycle Analytics (between 1st iteration and 2nd iteration)

Closes #41743

See merge request gitlab-org/gitlab-ce!16270

Double padding for file-content wiki class on larger screens

See merge request gitlab-org/gitlab-ce!16534

Filter groups and projects dropdowns of search page on backend

Closes #38739

See merge request gitlab-org/gitlab-ce!16336

Signed-off-by: Rémy Coutable <remy@rymai.me>

https://gitlab.com/gitlab-org/gitlab-ce/issues/34252

Fix bug in security release with deploy keys migration

See merge request gitlab-org/gitlab-ce!16531

Further simplify app/views/projects/buttons/_dropdown.html.haml

See merge request gitlab-org/gitlab-ce!16503

Backport 10.3.4 security fixes into master

See merge request gitlab-org/gitlab-ce!16509

Open visibility help in new tab

Closes #39591

See merge request gitlab-org/gitlab-ce!16268

Resolve "Closed issue label in todo's styling is difficult to read"

Closes #41874

See merge request gitlab-org/gitlab-ce!16414

Resolve "Allow toggling of performance bar in development"

Closes #42006

See merge request gitlab-org/gitlab-ce!16495

Revert "Merge branch 'pre-commit-prettier' into 'master'"

See merge request gitlab-org/gitlab-ce!16217

The performance bar is still displayed by default in development.
Signed-off-by: Rémy Coutable <remy@rymai.me>

Fast blank can speed things up. Spotify uses it as well…

See merge request gitlab-org/gitlab-ce!16468

Add view elements to deploy keys pages

See merge request gitlab-org/gitlab-ce!16464