In Rails 5 catches invalid UTF8 characters in querystring in a
params middleware, errors are handled by a params middleware and
raises a BadRequest exception. This means that these UTF8 errors
are not raised deeper in application stack and these can't also
be handled on application level.

If we would want to have custom handler for these errors, we would
have to create a new middleware and insert it before actionpack's
params middleware and rescue BadRequest exceptions there. But there
is no need to do this currently (see discussion on
https://gitlab.com/gitlab-org/gitlab-ce/issues/51908)

Fix duplicated key in license management job gitlab-org/gitlab-ce#52609

Closes #52609

See merge request gitlab-org/gitlab-ce!22311

Fix rubocop complaining about unicorn.rb

See merge request gitlab-org/gitlab-ce!22332

Update merge request diff navigation docs

See merge request gitlab-org/gitlab-ce!22275

Drop support for Go 1.9 in GitLab 11.4

Closes #51982

See merge request gitlab-org/gitlab-ce!22324

Updates the check for started in job header

See merge request gitlab-org/gitlab-ce!22329

Add stage name in job.json response

Closes #52618

See merge request gitlab-org/gitlab-ce!22317

The function that was checking if the job was started or not
was expecting a boolean, however it was receiving a null.
During the refactor the condition was changed, causing the function
to break with null

This commit fixes the check

Fix the event API docs

Closes #52512

See merge request gitlab-org/gitlab-ce!22320

Backport CE changes for Ops Dashboard in EE

See merge request gitlab-org/gitlab-ce!22136

Updates gitlab-svg dependency

See merge request gitlab-org/gitlab-ce!22299

Update GitLab Pages to v1.2.1

See merge request gitlab-org/gitlab-ce!22318

Hide job sidebar on mobile

Closes #52608

See merge request gitlab-org/gitlab-ce!22314

Resolve "Make file browser hidden by default for mobile screens" and improve layout in small screens too

Closes #52361

See merge request gitlab-org/gitlab-ce!22273

This commit adds back `js-` classes needed to
automatically collapse the sidebar on resize.

Specification change: Fix asciidoctor block context.

See merge request gitlab-org/gitlab-ce!22280

Fix broken file name navigation on MRs

Closes #50185

See merge request gitlab-org/gitlab-ce!22109

4. enable jasmine/prefer-jasmine-matcher

See merge request gitlab-org/gitlab-ce!22236

1. enable jasmine/new-line-between-declarations

See merge request gitlab-org/gitlab-ce!22230

Fix erased block not being rendered when job was erased

Closes #52570

See merge request gitlab-org/gitlab-ce!22294

Update copy to clipboard button data for application secret

Closes #52572

See merge request gitlab-org/gitlab-ce!22268

Fix project deletion when there is a export available

Closes #52362

See merge request gitlab-org/gitlab-ce!22276

Support pushing of feature flags to the frontend

Closes gitlab-org/release/framework#17

See merge request gitlab-org/gitlab-ce!22197

Adds `.json` to the end of pipelines endpoint

Closes #52472

See merge request gitlab-org/gitlab-ce!22293

Stuck block URL links to runners settings

Closes #52519

See merge request gitlab-org/gitlab-ce!22286

This adds a method to Gitlab::GonHelper called
`push_frontend_feature_flag`. This method can be used to easily expose
the state of a feature flag to Javascript code. For example, using this
method we may write the following controller code:

    before_action do
      push_frontend_feature_flag(:vim_bindings)
    end

    def index
      # ...
    end

    def edit
      # ...
    end

In Javascript we can then check the state of the flag as follows:

    if ( gon.features.vimBindings ) {
      // ...
    }

Fixes https://gitlab.com/gitlab-org/release/framework/issues/17