Fix error 500 when viewing commit and merge request diffs

Closes #41735

See merge request gitlab-org/gitlab-ce!16272

Due to the refactoring in !16082, `Blob#batch` no longer falls back
to a default `blob_size_limit`. Since `Repository#batch_blobs` was using
a default `nil` value, this would cause issues in the `Blob#find_by_rugged`
method.

This fix here is to be consistent and use a non-nil default value in
`Repository#batch_blobs`.

The problem was masked in development and tests because Gitaly is always
enabled by default for all features.

Closes #41735

Resolve "Improve non-triggered manual action job detail page"

Closes #22643 and #37843

See merge request gitlab-org/gitlab-ce!15991

Resolve "Clearing the cache"

Closes #41249

See merge request gitlab-org/gitlab-ce!16067

Fix rebase commit SHA migration name

See merge request gitlab-org/gitlab-ce!16256

Skip project repository disk validation in development project seeder

Closes gitlab-development-kit#310

See merge request gitlab-org/gitlab-ce!16257

Remove labeled issues seed

See merge request gitlab-org/gitlab-ce!16258

Move git operations for multi_action into Gitlab::Git

Closes gitaly#872

See merge request gitlab-org/gitlab-ce!16215

Prevent cluster migration spec from interfering with later specs

See merge request gitlab-org/gitlab-ce!16255

When seeding the GDK with new projects, it's very common to reuse
the same repository names on disk. Previously, the validation would
fail and leave the projects in a half-broken state. We can skip
the validation to avoid causing odd errors.

Closes gitlab-org/gitlab-development-kit#310

This already existed in EE with a different timestamp, so rename for CE and make
it idempotent.

Port of EE translations

See merge request gitlab-org/gitlab-ce!16254

Improve filtering issues by label performance

Closes #40500 and #37143

See merge request gitlab-org/gitlab-ce!16136

If a later spec tries to set a field that is added to any of these models by a
later migration than the GCP clusters migration, it will fail because the
model's columns are cached.

We should always refer to models in migration specs by either their class in the
migration, or the table directly, using the `table` helper.

Resolve "Helpful and instructing Empty state for multi file editor"

Closes #41048 and #41641

See merge request gitlab-org/gitlab-ce!16224

Copy Mermaid graphs as GFM

Closes #41211

See merge request gitlab-org/gitlab-ce!16046

New Crowdin translations

See merge request gitlab-org/gitlab-ee!3930

Use --left-right and --max-count for counting diverging commits

Closes #40622 et #37843

See merge request gitlab-org/gitlab-ce!15963

CE Backport of reordering issues in epics

See merge request gitlab-org/gitlab-ce!16247

Fix custom name in branch creation for issue in Firefox

Closes #41563

See merge request gitlab-org/gitlab-ce!16244

API: get participants from merge_requests & issues

Closes #40986

See merge request gitlab-org/gitlab-ce!16187

Resolve "Create secrets failed for Auto DevOps with latest stable of kubectl"

Closes #41376

See merge request gitlab-org/gitlab-ce!16218

Backport 'Rebase' feature from EE to CE

Closes #40301

See merge request gitlab-org/gitlab-ce!16071

Remove the Project#repo method

See merge request gitlab-org/gitlab-ce!16238