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

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

Update Gitaly version

See merge request gitlab-org/gitlab!77162

Add url, approved_by, and  merged_by to merge template

See merge request gitlab-org/gitlab!75639

Add performance indicator changes to Danger

See merge request gitlab-org/gitlab!77017

Remove outdated GitLab version refs in Issues API

See merge request gitlab-org/gitlab!77140

Fix Prometheus client state not being reset

See merge request gitlab-org/gitlab!77157

Correct dotenv configuration

See merge request gitlab-org/gitlab!77123

Update job dependencies view

See merge request gitlab-org/gitlab!77036

Merge branch '344346-make-badges-in-app-views-admin-groups-_group-html-haml-pajamas-compliant' into 'master'

Make badge in admin/groups/_group partial Pajamas-compliant

See merge request gitlab-org/gitlab!77003

Refactored Badges on IDE pipeline tab

See merge request gitlab-org/gitlab!77116

Edited language slightly

See merge request gitlab-org/gitlab!77149

Add missing link to issues doc

See merge request gitlab-org/gitlab!77122

Clarify that guest users will not take seats under an Ultimate license

See merge request gitlab-org/gitlab!70464