This commit migrates events data in such a way that push events are
stored much more efficiently. This is done by creating a shadow table
called "events_for_migration", and a table called "push_event_payloads"
which is used for storing push data of push events. The background
migration in this commit will copy events from the "events" table into
the "events_for_migration" table, push events in will also have a row
created in "push_event_payloads".

This approach allows us to reclaim space in the next release by simply
swapping the "events" and "events_for_migration" tables, then dropping
the old events (now "events_for_migration") table.

The new table structure is also optimised for storage space, and does
not include the unused "title" column nor the "data" column (since this
data is moved to "push_event_payloads").

== Newly Created Events

Newly created events are inserted into both "events" and
"events_for_migration", both using the exact same primary key value. The
table "push_event_payloads" in turn has a foreign key to the _shadow_
table. This removes the need for recreating and validating the foreign
key after swapping the tables. Since the shadow table also has a foreign
key to "projects.id" we also don't have to worry about orphaned rows.

This approach however does require some additional storage as we're
duplicating a portion of the events data for at least 1 release. The
exact amount is hard to estimate, but for GitLab.com this is expected to
be between 10 and 20 GB at most. The background migration in this commit
deliberately does _not_ update the "events" table as doing so would put
a lot of pressure on PostgreSQL's auto vacuuming system.

== Supporting Both Old And New Events

Application code has also been adjusted to support push events using
both the old and new data formats. This is done by creating a PushEvent
class which extends the regular Event class. Using Rails' Single Table
Inheritance system we can ensure the right class is used for the right
data, which in this case is based on the value of `events.action`. To
support displaying old and new data at the same time the PushEvent class
re-defines a few methods of the Event class, falling back to their
original implementations for push events in the old format.

Once all existing events have been migrated the various push event
related methods can be removed from the Event model, and the calls to
`super` can be removed from the methods in the PushEvent model.

The UI and event atom feed have also been slightly changed to better
handle this new setup, fortunately only a few changes were necessary to
make this work.

== API Changes

The API only displays push data of events in the new format. Supporting
both formats in the API is a bit more difficult compared to the UI.
Since the old push data was not really well documented (apart from one
example that used an incorrect "action" nmae) I decided that supporting
both was not worth the effort, especially since events will be migrated
in a few days _and_ new events are created in the correct format.

Remove affix plugin from issuable sidebar with new navigation

See merge request !13449

Render new issue link in failed job as a regular link instead of a UJS one

Closes #36158

See merge request !13450

Added a template for database changes

See merge request !12355

Fix conflicting redirect search

See merge request !13357

This template includes a rather large (but fairly easy to follow)
checklist. This checklist should hopefully take away quite a bit of work
from database specialists by requiring authors to provide all the
necessary info.

[ci skip]

Aligns OR separater to center properly

Closes #36185

See merge request !13446

Include RE2 in the upgrade docs

See merge request !13448

Remove unused `redirect_to_external_issue_tracker` method

See merge request !13444

Updating Gemfile.lock for rubocop-rspec dependecy.

See merge request !13410

This isn't required with the new navigation as it is always position fixed so we are just creating a scroll event listener that will never actually do anything

alternative route for download archive

See merge request !13439

Fix the sticky changes bar on commits page

See merge request !13343

Removed display styles when hiding the fly out navigation

Closes #36224

See merge request !13431

Its usage has been removed at 2fa22a07.

Add missing command to compile GetText files

See merge request !13437

Rename RPC 'Exists' to 'RepositoryExists'

See merge request !13277

Fix proxy config in Gitlab Pages nginx examples

See merge request !13375

Don't include anything to Kernel only because of tasks

Closes #36003

See merge request !13380

Prevent user from changing username with container registry tags

Closes #35451

See merge request !13356

Enable the Layout/SpaceBeforeBlockBraces cop

See merge request !13413

Update icon color on hover

Closes #35996

See merge request !13393

Fixed merge request changes sticky container not spreading full width

See merge request !13386

Signed-off-by: Rémy Coutable <remy@rymai.me>

Closes #36224

Align all nav items in sidebar

Closes #36179

See merge request !13392

Fix height of collapsed sidebar items

See merge request !13385

Explain why we use select all for project_url_constrainer.rb

See merge request !13425

Fix Pikaday being undefined

Closes #36207

See merge request !13422