Modal errors as objects are introduced:
https://github.com/rails/rails/pull/32313

model.errors.first returns ActiveModel::Error object
that's why model.errors.first[1] doesn't work in Rails 6.1

We need a way that works both for 6.1 and 6.0 in order to
introduce changes gradually:

model.errors.values.first works for both versions.

Even though treating errors as a hash is deprecated it works
so we can introduce the changes in 6.0 and then fix the
deprecations when we're on 6.1

(cherry picked from commit b5ecc309)

Update default branch name in vue_shared specs

See merge request !59865

Remove unneeded index on packages_debian_{project,group}_architectures.distribution_id

See merge request !59615

Externalize strings in  application_settings/_abuse.html.haml

See merge request !57968

Add an inner class in the cleanup container repository worker [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request !56989

Add specific rate limits for package registry

See merge request !57029

Pipeline Layers View: Add introduced and rollout links to flag

See merge request !59877

Add solargraph to development dependencies

See merge request !59015

Added new emoji picker to project snippets

See merge request !59783

Pipeline Graph: Update graph state selection

See merge request !59685

Update UI text for confluence integration

See merge request !59839

Externalise strings in requests_profiles/index.html.haml

See merge request !58161

Allow access to registry API of the current project using the job token [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request !49750

Enable new wiki delete page RPC [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request !57106

Add gl-badge for badges in milestone drawer

See merge request !57964

Update Debian group level endpoints urls

See merge request !59609

Remove a Gitaly allow_disk_access call

See merge request !59879

Override min/max for usage data queries in EE module

See merge request !59365

Fix specs for tracking CI minutes when runner is specific

See merge request !59875

Fix huge typo: private -> public

See merge request !59880

Allow to update epic boards lists with GraphQL

See merge request !58782

Remove alpha badging from terraform state administration docs

See merge request !59781

The implementation was fixed in this MR:
gitlab-foss!21238

However, the allowlist and issue reference was never removed.

I also take the opportunity to add a comment explaining that the user
must have permission to update the branch, since that wasn't very clear
to me when reading through this code.

Add an example for pipeline processing

See merge request !59631

Previous specs were running on public project which by
default gets a 0.0 Runner cost factor. Switching to use
private projects we test the actual logic of returning
0.0 Runner cost factor when runner is specific.

Docs for changelog entries for metric removals

See merge request !59854

Set Hipchat metric definitions status to removed

See merge request !59779