Add an index to the `store` column on `uploads`. This makes counting
local uploads faster.

Also, there is no longer need to check for objects with `store = NULL`.
See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18557

---

### Query plans

Query:

```sql
SELECT COUNT(*)
FROM "uploads"
WHERE ("uploads"."store" = ? OR "uploads"."store" IS NULL)
```

#### Without index

```
gitlabhq_production=# EXPLAIN ANALYZE SELECT uploads.* FROM uploads WHERE (uploads.store = 1 OR uploads.store IS NULL);
                                                  QUERY PLAN
---------------------------------------------------------------------------------------------------------------
 Seq Scan on uploads  (cost=0.00..601729.54 rows=578 width=272) (actual time=6.170..2308.256 rows=545 loops=1)
   Filter: ((store = 1) OR (store IS NULL))
   Rows Removed by Filter: 4411957
 Planning time: 38.652 ms
 Execution time: 2308.454 ms
(5 rows)
```

#### Add index

```
gitlabhq_production=# create index uploads_tmp1 on uploads (store);
CREATE INDEX
```

#### With index

```
gitlabhq_production=# EXPLAIN ANALYZE SELECT uploads.* FROM uploads WHERE (uploads.store = 1 OR uploads.store IS NULL);
                                                          QUERY PLAN
-------------------------------------------------------------------------------------------------------------------------------
 Bitmap Heap Scan on uploads  (cost=11.46..1238.88 rows=574 width=272) (actual time=0.155..0.577 rows=545 loops=1)
   Recheck Cond: ((store = 1) OR (store IS NULL))
   Heap Blocks: exact=217
   ->  BitmapOr  (cost=11.46..11.46 rows=574 width=0) (actual time=0.116..0.116 rows=0 loops=1)
         ->  Bitmap Index Scan on uploads_tmp1  (cost=0.00..8.74 rows=574 width=0) (actual time=0.095..0.095 rows=545 loops=1)
               Index Cond: (store = 1)
         ->  Bitmap Index Scan on uploads_tmp1  (cost=0.00..2.44 rows=1 width=0) (actual time=0.020..0.020 rows=0 loops=1)
               Index Cond: (store IS NULL)
 Planning time: 0.274 ms
 Execution time: 0.637 ms
(10 rows)
```

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/6070

Remove gitlab-ui loading icon from global (EE)

See merge request gitlab-org/gitlab-ee!8170

EE port of mr-image-commenting

See merge request gitlab-org/gitlab-ee!8254

Merge branch 'ee-52771-ldap-users-can-t-choose-private-or-internal-when-creating-a-new-group' into 'master'

Fix new group visibility form for non-admins

See merge request gitlab-org/gitlab-ee!8263

Support epics autocomplete for project objects

Closes #7472

See merge request gitlab-org/gitlab-ee!8180

Removes an owner permission check before rendering the visibility
select radio inputs as non-admins will not have permission.

Ensures all users creating a group can select its visibility.

Docs: add notes on group SSO user management

See merge request gitlab-org/gitlab-ee!8260

Geo - Redirect user back to the secondary after a logout & re-login via the primary

Closes #4459

See merge request gitlab-org/gitlab-ee!8157

Update link to code quality docs

See merge request gitlab-org/gitlab-ee!8221

In Ruby 2.4, `URI.join("http://test//", "a").to_s` will
remove the double slash, however it's not the case in
Ruby 2.5. Using chomp should work better for the intention,
as we're not trying to allow things like ../ or / paths
resolution.

This helper method append path to host, making sure
there's one single slash as path separator.

Send notifications for epic status change

Closes #7272

See merge request gitlab-org/gitlab-ee!8247

Geo: Improve read-only message in secondary nodes for actionable screens

Closes #8124

See merge request gitlab-org/gitlab-ee!8238

Docs outline scaling options

See merge request gitlab-org/gitlab-ee!7824

Configurable GitHub static context for statuses integration

Closes #6696

See merge request gitlab-org/gitlab-ee!8235

Redirect user back to the secondary after a logout & re-login
via the primary.

- add sending notifications to epics close/reopen services
- add epics status change email templates
- add methods to epics mailer and notification service

added step to populate fdw tables when using external database

See merge request gitlab-org/gitlab-ee!8113

EE: Rewrite SnippetsFinder to improve performance

Closes gitlab-ce#52639

See merge request gitlab-org/gitlab-ee!8105

ee port: Renders a warning block for archived job

See merge request gitlab-org/gitlab-ee!8250

Group SAML status badges on members page

Closes #4515

See merge request gitlab-org/gitlab-ee!5807

Move EE prepend/include to the end of workers

See merge request gitlab-org/gitlab-ee!8206

Move EE prepend/include to the end of presenters

See merge request gitlab-org/gitlab-ee!8205

Move EE prepend/include to the end of policies

See merge request gitlab-org/gitlab-ee!8204

- add epics routes to the application_helper
- create epics action in AutocompleteController

CE upstream - 2018-11-06 12:21 UTC

Closes #8040

See merge request gitlab-org/gitlab-ee!8251

Move EE prepend/include to the end of mailers

See merge request gitlab-org/gitlab-ee!8202