Fix regression in rendering Markdown references that do not exist

Closes #30972

See merge request !10716

Merge branch '30492-using-icon-to-mark-discussion-as-resolved-does-not-resolve-discussion' into 'master'

Resolve "Using icon to mark discussion as resolved does not resolve discussion"

Closes #30492

See merge request !10652

Issue Title Vue: convert to .vue - use 'render' with 'createElement' in index

See merge request !10625

Closes #30972

Turn on caching of classes in Knapsack specs

See merge request !10709

Enabling caching of classes slows start-up time because all controllers
are loaded at initialization, but it reduces memory and load because files
are not reloaded with every request. For example, caching is not necessary
for loading database migrations but useful for handling Knapsack specs.

Addresses gitlab-org/gitlab-ee#2162

Fix note header timeago and action overlap

Closes #30810

See merge request !10644

Only add newlines for multiple uploads

Closes #29782

See merge request !10545

Add expirations to CA and user callouts

Closes #30267

See merge request !10568

frontend prevent authored votes

Closes #21881

See merge request !6260

Use the hashie-forbideen_attributes gem

Closes #26400

See merge request !10579

Revert "Merge branch 'grpc-1.2.2' into 'master'"

See merge request !10700

Update show.html.haml to allow guests to see the Files tab as per #30199

See merge request !10640

Implement Users::BuildService

Closes #30349

See merge request !10675

Closes #28531 - Enable the import_url field.

Closes #28531

See merge request !9438

Expand components version specification format to allow branches

Closes gitaly#183

See merge request !10610

This reverts merge request !10589

Improve error messages when a record is unable to be created for a project

See merge request !10696

Allow to enable `rspec_profiling` for a branch on the CI

Closes #30907

See merge request !10680

Centered empty state for issues

Closes #30872

See merge request !10689

Add lighter colors and fix existing light colors

See merge request !10690

Make instructions clearer

See merge request !10685

Use an icon to indicate whether service template is active

See merge request !10694

Currently we specify versions for Gitlab-Shell, Workhorse and Gitaly
using version strings, to which we prepend 'v' and assume are tags.
These changes allow branches or tags with other name formats to be
specified by prepending '=' to the version string (á la govendor).

We also simplify the process to reset to the given version (now a
branch or tag): Right now there's a check to supposedly try to avoid
fetching from the remote the version if it already exist locally. But
the previous logic already clones if the directory doesn't exist or
fetches if it does, so this check is pointless. We can safely assume the
version exists once we get to the reset stage.

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/30810