Don't blow up when email has no References header

Closes gitlab-ee#2247

See merge request !11014

Sort the network graph both by commit date and topographically

Closes #30973

See merge request !11057

Handle incoming emails from aliases correctly

See merge request !11079

Fixed bug where merge request JSON would show

Closes #28909

See merge request !11096

Fixed search terms not highlight

Closes #31997

See merge request !11198

[ci skip]

[ci skip]

* dev/9-1-stable:
  Update VERSION to 9.1.3
  Update CHANGELOG.md for 9.1.3

[ci skip]

Use GroupsFinder to find subgroups the user has access to

See merge request !2096

New Hamlit XSS fix, does not include extraneous changes

See merge request !2095

Refactor snippets finder & dont return internal snippets for external users

See merge request !2094

Fix XSS in branches dropdown

See merge request !2093

Respect project features in wiki and blob search

See merge request !2089

Fix snippets visibility for show action - external users can not see internal snippets

See merge request !2087

droplab templating xss fix

See merge request !2085

Sanitize submodule URLs before linking to them in the file tree view

See merge request !2084

(security-9-1) Render asciidoc & other markup using banzai in a pipeline

See merge request !2098

(security-9-1) Add correct `rel` attributes to external links when rendering markdown

See merge request !2097

[ci skip]

add issues and merge-requests classes and use to find in rspec

See merge request !10980

Accept default branch param on notifaction services

Closes #31173

See merge request !10959

Use GitLab Pages v0.4.1

See merge request !10891

Add index on ci_runners.contacted_at

Closes #31229

See merge request !10876

Refactoring rake task to import GitHub repositories

See merge request !10695

correct documentation on opt-out-ness of usage ping

See merge request !10945

Skip validation when creating internal (ghost, service desk) users

See merge request !10949

Fix ordering of commits in the network graph.

Closes #30973

See merge request !10936

Resolve "Milestone sidebar display incorect number of MR when minimized"

Closes #31292

See merge request !10933

Remove description for build_events, add pipeline_events

Closes #30645

See merge request !10908

Lazily set UUID in ApplicationSetting for new installations

Closes gitlab-ee#2246

See merge request !10893

[ci skip]

Ensures that OAuth/LDAP/SAML users don't need to be confirmed

See merge request !10925

Skip issuable without a project in IssuableExtractor#extract

Closes #31280

See merge request !10906