Prepare 10.5 RC2 release

See merge request gitlab-org/gitlab-ce!17001

Bumps Gitlab Shell version to 6.0.3

See merge request gitlab-org/gitlab-ce!17008

10.5 Update the dependencies license list

See merge request gitlab-org/gitlab-ce!16998

10.5 Update the `.gitignore`, `.gitlab-ci.yml`, and `Dockerfile` templates

See merge request gitlab-org/gitlab-ce!16997

10.5 Create the "Update" guides

See merge request gitlab-org/gitlab-ce!16996

10.5 Update the "Installation from Source" guide

See merge request gitlab-org/gitlab-ce!16995

Memoize MergeRequest#rebase_in_progress? to prevent N+1 queries in Gitaly

Closes gitlab-ee#4857

See merge request gitlab-org/gitlab-ce!16990

Update 10-5-stable to freeze point

See merge request gitlab-org/gitlab-ce!16993

Annotate charts page for internationalization

See merge request gitlab-org/gitlab-ce!16687

Resolve "New design for user deletion confirmation in admin area"

Closes #41301

See merge request gitlab-org/gitlab-ce!16811

Resolve "New design for cancel / stop pipeline confirmation"

Closes #41297

See merge request gitlab-org/gitlab-ce!16813

Annotate graph page for internationalization

See merge request gitlab-org/gitlab-ce!16688

Resolve "New design for project deletion confirmation"

Closes #41300

See merge request gitlab-org/gitlab-ce!16812

Fix tests

Address code review feedback

Fix tests

Use prometheus-client-mmap released, final version

See merge request gitlab-org/gitlab-ce!16984

Merge branch '42864-update-vendored-autodevops-yml-for-latest-browser-performance-testing-changes' into 'master'

Update vendored AutoDevOps YML for latest Browser Performance Testing changes

Closes #42864

See merge request gitlab-org/gitlab-ce!16982

Migrate Git::Blob.batch to Gitaly

Closes #37445 and gitaly#985

See merge request gitlab-org/gitlab-ce!16928

Add instructions for source installation to mysql_to_postgresql.md

See merge request gitlab-org/gitlab-ce!16983

Closes gitaly#985

Resolve "Cancelling a second comment edit doesn't return its state to before the edit"

Closes #42462

See merge request gitlab-org/gitlab-ce!16869

Replace $.ajax in profile.js with axios

See merge request gitlab-org/gitlab-ce!16895

Update prometheus gem to version 0.9.1.pre.rc.2 fixing segfaults happening on metrics deletion

See merge request gitlab-org/gitlab-ce!16964

Replace $.get in diff file editor with axios

See merge request gitlab-org/gitlab-ce!16896

Cache Gitaly FindCommit RPC response

See merge request gitlab-org/gitlab-ce!16949

Remove duplicate calls of MergeRequest#can_be_reverted? on MR widget endpoint

See merge request gitlab-org/gitlab-ce!16975

Updating `HelpController` spec to use an existing image

See merge request gitlab-org/gitlab-ce!16977

CE Port: for Filtered search releated changes

See merge request gitlab-org/gitlab-ce!16917