Read true-up info from license and validate it

Closes #550

See merge request !1159

adds select field and sync time migration for mirror sync cron jobs

Closes #99

See merge request !1115

Diplay correct message in git clients when License is not configured

See merge request !1133

We're also considering the scenario where historical data is present but
we don't have the number of previous seats which is the case when some
customers upgrade from CE.

- Allow the message to be returned from git_http controller
- Strip html chars from message returned via API

Squash binary files

See merge request !1174

Elasticsearch: allow initial indexing to proceed within Sidekiq

Closes #1618

See merge request !1144

Prior to this commit, the `index_statuses` table was allowed to go stale after
initial indexing. This made it impossible to provide status details, and also
made treating the initial index as a 'backfill' job harder.

Now, if a repository is indexed via `git push`, the initial indexing will
recognise that it has been indexed, and not re-index it.

We introduce an asynchronous initial indexer and an index status rake task at
the same time.

Port "V4 API: Remove deprecated MR and Issue endpoints and preserve V3 namespace"

See merge request !1166

Geo: send the new event type with the backfill function

Closes #1645

See merge request !1157

Rugged's `#to_patch` method doesn't generate a patch suitable for binary
files. Instead, piping `git diff --binary` to `git apply` will do this
and avoid allocating strings in Ruby, as an added bonus.

CE upstream

Closes gitlab-ce#27674

See merge request !1170

This commit introduces a `gitlab:elastic:index_repositories_async' rake task,
which can be used to enqueue a set of indexing jobs into Sidekiq. These will
be scheduled in the usual manner, in the `sidekiq` queue.

In theory, this allows Sidekiq's concurrency and distributed execution features
to be used to spread and control the load of indexing repositories.

CE upstream

Closes #395

See merge request !1161

Add index to labels for `type` and project_id`

Closes #27676

See merge request !8978

Fixed typo in slash commands docs

Closes #27674

See merge request !8976

Fix "NameError: uninitialized constant Rack::Proxy" in production environment

See merge request !1168

When loading pages that display the number of open issues,
the backend runs a query such as:

```sql
SELECT "labels"."id" FROM "labels" WHERE "labels"."type" IN ('ProjectLabel') AND "labels"."project_id" = 1000
```

This results in an entire scan of the `labels` table. To optimize performance,
add the appropriate index to the table.

Closes #27676

Fix "NameError: uninitialized constant Rack::Proxy" in production environment

See merge request !8977