Add Terraform States to Backup and Restore tasks

See merge request gitlab-org/gitlab!63347

Reuses standard file upload storage to cover Terraform
states backup

Adds a seed for generating terraform state files
under each project

Manual testing (in local GDK env):

- Verfied seed addition via `bin/rake db:seed_fu FILTER=terraform`
- Verified seed addition is repeatable, with no-ops if versions
  pre-exist
- Created backup: `bin/rake gitlab:backup:create`
- Verified output shows up:

```
2021-06-05 23:48:54 +0530 -- Dumping terraform states ...
2021-06-05 23:48:54 +0530 -- done
```

- Verified tar contains terraform_state.tar.gz
- Verified terraform_state.tar.gz carries content
- Destroyed all records: `Terraform::State.destroy_all`
- Deleted all files: `rm -rf shared/terraform_state/*`
- Performed restore: `bin/rake gitlab:backup:restore`
- Verified `Terraform::State.all` shows back older records
- Verified association of builds to some of these records
- Verified `shared/terraform_state/` is repopulated
- Verified `Terraform::StateVersion.each do |sv| pp sv.file.read end`
  works and shows the seed-added data
- Verified skipping of `terraform_state` keyword works:

```
2021-06-06 00:11:33 +0530 -- Dumping terraform states ...
2021-06-06 00:11:33 +0530 -- [SKIPPED]
```

Verified with same workflow as above (backup, destroy, delete,
then restore) that skipped backup variant does not contain
`terraform_state.tar.gz` and does not show up those files after
restore

Miscellany:

- Adds a missing test for LFS backups
- Adds File operation fixes to neighboring tests
  so when they fail RSpec is able to show diffs
- Modified test validates unknown SKIP values not
  breaking backups
  - This is useful to catch any regressions during
    upgrades where pre-installs scripts may refer
    to a new SKIP value that isn't recognized by
    the old version

Changelog: added

Handle escalation changes issue type change

See merge request gitlab-org/gitlab!75706

- Add Escalation status to all new incidents
- Add policy and escalation started at for escalations_started_at for EE
- Policy and escalations_started_at behind incident_escalations FF

Changelog: added

Remove deprecated package metrics

See merge request gitlab-org/gitlab!76710

Remove unnecessary warning on Generic Packages Repository

See merge request gitlab-org/gitlab!77194

Initial draft of security policies vs compliance pipelines docs

See merge request gitlab-org/gitlab!77074

CTRT edits for project import export doc

See merge request gitlab-org/gitlab!76894

Temporary fix broken feature spec

See merge request gitlab-org/gitlab!77196

Update testcase link for praefect repo sync spec

See merge request gitlab-org/gitlab!77195

Add e2e for praefect set-replication-factor

See merge request gitlab-org/gitlab!75707

Bump agentk version for QA test

See merge request gitlab-org/gitlab!75057

Fix version history in commit_templates.md, minor example update

See merge request gitlab-org/gitlab!77192

Simplify pipeline types documentation

See merge request gitlab-org/gitlab!76740

Add vulnerability_states for scan_result_policies

See merge request gitlab-org/gitlab!76865

Introduce linear root method in UpdateAllMirrorsWorker

See merge request gitlab-org/gitlab!76735

Merge branch '342233-define-policy-on-performance_indicator_type-in-service-ping-metrics-defintion' into 'master'

Add docs and issue template for performance indicator changes

See merge request gitlab-org/gitlab!76656

Replace Namespace#self_and_hierarchy with linear version

See merge request gitlab-org/gitlab!76814

[ci skip]

[ci skip]

Merge branch '344411-make-badges-in-app-views-shared-members-_badge-html-haml-pajamas-compliant' into 'master'

Resolve "Make badges in app/views/shared/members/_badge.html.haml Pajamas-compliant"

See merge request gitlab-org/gitlab!76906

In this commit we're introducing the new linear root method
in the UpdateAllMirrorsWorker behind a feature flag.

Remove outdated limitation from secure report integrations

See merge request gitlab-org/gitlab!77150

Move event streaming in to after commit queue

See merge request gitlab-org/gitlab!76765

Remove legacy shared confirm_modal partial

See merge request gitlab-org/gitlab!76646

Fix GraphQL API mergeUser is null when mergeWhenPipelineSucceeds is false

See merge request gitlab-org/gitlab!76043

Added gitlab-rails cheatsheet commands to update the runners registration token

See merge request gitlab-org/gitlab!77153

Add namespace to the ci_minutes_usage resolver

See merge request gitlab-org/gitlab!74436

Move external_pull_requests to CI DB

See merge request gitlab-org/gitlab!76824