Bump VERSION to 4.17.0

• Diff: v4.16.0...ea0c3904

• Release notes:

### New scenarios and scenario updates

- !360 Disable animations by default in GitLab component

### Fixes

- !358 Fix Typo in code comment
- !357 Treat RC releases as official releases for the QA image
- !364 Fix slack notification message
- !355 Fix notify_upstream_commit jobs

### Doc changes

- !354 Note that an EE license is required when running EE tests

### Other changes (CI, backstage)

- !361 Notify slack on failure when triggered from scheduled master
- !365 Reverse TOP_UPSTREAM_SOURCE_REF and RELEASE
- !362 Add job for custom tests
- !353 Stop combining reports
- !359 Remove report from notify_upstream_commit
- !351 Add back quarantine jobs as manual

• Checklist before merging:

  • Diff link is up-to-date.
  • Based on the diff, lib/gitlab/qa/version.rb is updated, according to SemVer.
  • Release notes are accurate.

• Checklist after merging:

  • Create a tag for the new release version.