Fix incorrect prefix used in new uploads for personal snippets

Closes #61671

See merge request gitlab-org/gitlab-ce!28337

SSO enforcement docs details added from 11.11

See merge request gitlab-org/gitlab-ce!28394

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24550 fixed the
case where the wrong path on disk was being searched, but it
inadvertently ommitted the `/uploads/-/system` prefix when rendering the
Markdown for personal snippet uploads when they were stored directly in
object storage.

A personal snippet path is stored using FileUploader#upload_path.
The format for the path:

Local storage: :random_hex/:filename.
Object storage: personal_snippet/:id/:random_hex/:filename.

upload_paths represent the possible paths for a given identifier,
which will vary depending on whether the file is stored in local or
object storage. upload_path should match an element in upload_paths.

base_dir represents the path seen by the user in Markdown, and it
should always be prefixed with uploads/-/system.

store_dirs represent the paths that are actually used on disk. For
object storage, this should omit the prefix /uploads/-/system.

For example, consider the requested path
/uploads/-/system/personal_snippet/172/ff4ad5c2/file.png.

For local storage:

base_dir: uploads/-/system/personal_snippet/172
upload_path: ff4ad5c2/file.png
upload_paths: ["ff4ad5c2/file.png", "personal_snippet/172/ff4ad5c2/file.png"].
store_dirs: {1=>"uploads/-/system/personal_snippet/172/ff4ad5c2",
             2=>"personal_snippet/172/ff4ad5c2"}

For object storage:

upload_path: personal_snippet/172/ff4ad5c2/file.png

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/61671

Add ref (branch/tag) parameter to project search API

See merge request gitlab-org/gitlab-ce!28069

#46469 - Added ref querystring parameter to project search to allow searching on branches other than master

Update haml_lint to include linter spec helpers

Closes #61892

See merge request gitlab-org/gitlab-ce!28379

Clean up assets that are older than 4 days to reduce assets cache size

See merge request gitlab-org/gitlab-ce!28318

Docs: Update links and add badge to examples readme

Closes #61439

See merge request gitlab-org/gitlab-ce!28349

Update CI minutes docs regarding transferring of minutes and billing

See merge request gitlab-org/gitlab-ce!28293

Docs: Add badges and fix redirect style in 3 docs

Closes #61440

See merge request gitlab-org/gitlab-ce!28350

Docs: Update links and add badge to examples readme

Closes #61439

See merge request gitlab-org/gitlab-ce!28349

Docs: Delete orphaned images in `merge_requests/img`

Closes #61438

See merge request gitlab-org/gitlab-ce!28346

Resync the docs that were submitted to EE instead of CE

See merge request gitlab-org/gitlab-ce!28389

Fix emojis URLs

Closes #61914

See merge request gitlab-org/gitlab-ce!28371

Add subheadings to components page

See merge request gitlab-org/gitlab-ce!28382

Fix docs intro version for force auth for approvers

See merge request gitlab-org/gitlab-ce!28390

This feature was introduced in 12.0, not in 11.11.

Use process timer for jest timeout testing

See merge request gitlab-org/gitlab-ce!28209

Upgrade gitlab-shell to 9.2.0

See merge request gitlab-org/gitlab-ce!28372

Add haml-lint.yml to FE for roulette

See merge request gitlab-org/gitlab-ce!28301

Main change is to bump .ruby-version to 2.6.3 so versions
are consistent for the GDK.

Resolve CE/EE diffs in admin user access levels

Closes gitlab-ee#10507

See merge request gitlab-org/gitlab-ce!28359

Resolve CE/EE diffs in mirror repos settings

Closes gitlab-ee#11036

See merge request gitlab-org/gitlab-ce!28361

Explain render_if_exists opts caveat

See merge request gitlab-org/gitlab-ce!28366

Document what to do if review jobs keep failing

See merge request gitlab-org/gitlab-ce!28367

CE backport of "Configure the number of ES shards and replicas"

See merge request gitlab-org/gitlab-ce!28329

Signed-off-by: Rémy Coutable <remy@rymai.me>

Omit max-count for diverging_commit_counts behind feature flag

See merge request gitlab-org/gitlab-ce!28157

Changed the placeholder text of the diff tree filter input

Closes #58339

See merge request gitlab-org/gitlab-ce!28352

Disallow the review-deploy and review-qa-smoke jobs to fail

See merge request gitlab-org/gitlab-ce!28314