Reduce DB-load for build-queues by storing last_update in Redis

See merge request !8084

[EE] Use `:empty_project` in Project, User, MergeRequest, and MoveToProjectFinder specs

See merge request !1079

Port of 26138-combine-webhooks-and-services-settings-pages to EE

See merge request !1076

Remove redundant `Repository#fetch_remote_forced!` method

Closes #1537

See merge request !1080

We already have `#fetch_remote` which accepts a `forced` option and is
used in other sections of the codebase.

Introduce build minutes (again)

Closes #1405

See merge request !1078

Introduce build minutes

Closes #1405

See merge request !965

Revert "Merge branch 'introduce-build-minutes' into 'master'"

See merge request !1077

This reverts merge request !965

Introduce build minutes

Closes #1405

See merge request !965

Port of simple-eslint-fixes to EE

See merge request !1049

Time tracking api EE

See merge request !1073

New endpoints are:

POST :project_id/(issues|merge_requests)/(:issue_id|:merge_request_id)/time_estimate"

POST :project_id/(issues|merge_requests)/(:issue_id|:merge_request_id)/reset_time_estimate"

POST :project_id/(issues|merge_requests)/(:issue_id|:merge_request_id)/add_spent_time"

POST :project_id/(issues|merge_requests)/(:issue_id|:merge_request_id)/reset_spent_time"

GET  :project_id/(issues|merge_requests)/(:issue_id|:merge_request_id)/time_stats"

Small formatting/syntax fixes

See merge request !1070

MR Approvals Frontend-Backend Integration

Closes #1262, #894, and #1287

See merge request !954

Refactored 1st iteration of cycle analytics and stages in general (EE version)

See merge request !1064

[EE] Add a `:repository` trait to the `:empty_project` factory

See merge request !1068