In Rails 4.2 if params[:format] is empty, Rails set it to :html
But since Rails 5.0 the framework now looks for an extension.
E.g. for `blob/master/CHANGELOG.md` in Rails 4 the format would be
`:html`, but in Rails 5 on it'd be `:md`

This commit explicitly sets the `:html` format for all requests unless
`:format` is set by a client e.g. by JS for XHR requests.

Fix missing dots from the CI job log output

Closes #47817

See merge request gitlab-org/gitlab-ce!19871

Fix use template buttons for creating a new project

Closes #47580

See merge request gitlab-org/gitlab-ce!19654

Resolve ""Click to expand" link in collapsed diffs should be blue"

Closes #47938

See merge request gitlab-org/gitlab-ce!19867

Resolve "User tabs doesn't show spinner"

Closes #47905

See merge request gitlab-org/gitlab-ce!19862

Resolve "Project homepage > Clone dropdown/input larger than other buttons"

Closes #46699

See merge request gitlab-org/gitlab-ce!19726

Resolve "Placeholder note renders the user name in a new line"

Closes #47850

See merge request gitlab-org/gitlab-ce!19791

Resolve "Strange layout for pipelines list view"

Closes #47675 and #47858

See merge request gitlab-org/gitlab-ce!19788

Resolve "GFM: Color chips UI glitch"

Closes #47646

See merge request gitlab-org/gitlab-ce!19687

Move the trigger-build script into one location to serve both omnibus and cloud-native triggers.

See merge request gitlab-org/gitlab-ce!19837

Resolve "Performance bar Gitaly modal is hard to read"

Closes #47825

See merge request gitlab-org/gitlab-ce!19752

clarify ux label process

See merge request gitlab-org/gitlab-ce!19854

Resolve "Project homepage > Auto DevOps Enabled text is misaligned"

Closes #46700

See merge request gitlab-org/gitlab-ce!19789

Update permissions docs

Closes #45222

See merge request gitlab-org/gitlab-ce!19858

Resets state correctly when switching to merge request in IDE

Closes #47763

See merge request gitlab-org/gitlab-ce!19707

CE: Resolve "Extract EE specific files/lines for spec/spec_helper.rb"

See merge request gitlab-org/gitlab-ce!19851

Resolve "Tab active state is not changing correctly on new merge request page"

Closes #47871

See merge request gitlab-org/gitlab-ce!19781

Remove label link vertical alignment property

Closes #46080

See merge request gitlab-org/gitlab-ce!18777

Fix table_exists? to be Rails5 compatible

Closes #45107

See merge request gitlab-org/gitlab-ce!19418

Unify spec/lib/banzai/filter/image_lazy_load_filter_spec.rb

See merge request gitlab-org/gitlab-ce!19836

Move Gitaly RPCs to mandatory

Closes gitaly#217, gitaly#389, gitaly#390, gitaly#220, gitaly#376, and gitaly#354

See merge request gitlab-org/gitlab-ce!19759

Resolve "Reference to master still cached"

Closes #47851

See merge request gitlab-org/gitlab-ce!19827

Bring `rake postgresql_md5_hash` to CE

Closes gitlab-ee#6419

See merge request gitlab-org/gitlab-ce!19830

[Rails5] Fix snippets_finder arel queries

Closes #47832

See merge request gitlab-org/gitlab-ce!19796

Backport EE .flayignore lines to CE

See merge request gitlab-org/gitlab-ce!19829

Deny repository disk access in development and test

See merge request gitlab-org/gitlab-ce!19716