[EE] Change gitlab_sign_in to sign_in

See merge request !2255

Increase parallelism of geo repository sync worker

Closes #2742

See merge request !2351

Improve members view on mobile (EE Version)

See merge request !2387

This reverts commit 5c0b6314.

Project alias for Slack application can be edited

See merge request !2374

[EE] Allow to enable the performance bar per user or Feature group

See merge request !2344

Change new nav purple to indigo

See merge request !2382

[CE Port] Add creation time filters to user search API for admins

See merge request !2386

For reasons that are still unclear, the EE version (but only the EE
version) of this spec was failing reliably, and changing these calls
seemed to resolve it.

Strip out any HTML tags in Geo response and upon failure omit full response text

Closes #2786

See merge request !2318

EE: Added EachBatch for iterating tables in batches

See merge request !2377