Add promotion note for GL.com users

Closes #9545

See merge request gitlab-org/gitlab-ee!9430

Fix admin_ldap_sync_spec

See merge request gitlab-org/gitlab-ee!9454

Add basic docs about cross-project pipeline triggers

See merge request gitlab-org/gitlab-ee!9337

Adding convenience method to project model

See merge request gitlab-org/gitlab-ce!25108

Merge branch '57287-documentation-for-handling-more-complex-only-merge_requests-scenarios-is-sparse' into 'master'

Docs for MR pipeline rule interactions

Closes #57287

See merge request gitlab-org/gitlab-ce!24929

Fix security harness script

See merge request gitlab-org/gitlab-ce!25050

Address review comment for app/services/task_list_toggle_service.rb

Closes #57413

See merge request gitlab-org/gitlab-ce!25013

Port of EE translations

See merge request gitlab-org/gitlab-ce!25100

Add HTML output example to profiling

See merge request gitlab-org/gitlab-ce!25103

Change find flags to also work with Alpine

Closes #57341

See merge request gitlab-org/gitlab-ce!25104

Resolve "Follow-up from "API group labels""

Closes #57450

See merge request gitlab-org/gitlab-ce!25070

Refactor the upgrading from source docs

Closes gitlab-org/release/framework#190

See merge request gitlab-org/gitlab-ce!25003

EE: Refactor the upgrading from source docs

Closes gitlab-org/release/framework#190

See merge request gitlab-org/gitlab-ee!9519

Update on using self-signed certs with registry

See merge request gitlab-org/gitlab-ce!25086

This changes the guides for upgrading from CE source to EE source so we
no longer need separate documents for every version. This removes the
need for release managers to create and update these documents, and
allows developers to add these instructions as part of their code
changes.

Fix wrong documentation on jobs API

See merge request gitlab-org/gitlab-ee!9363

Fix branch API table format

Closes #57480

See merge request gitlab-org/gitlab-ce!25091

This changes the guides for upgrading from CE source to EE source so we
no longer need separate documents for every version. This removes the
need for release managers to create and update these documents, and
allows developers to add these instructions as part of their code
changes.

Instead of requiring one separate document for every version (which is
created by release managers), we now use a single document for both
Community Edition and Enterprise Edition. This allows developers to add
guidelines right away, instead of release managers having to determine
what to add.

Version specific upgrading instructions are placed in a separate
section. This prevents instructions from lingering around for many
versions should a developer forget to remove them. This also ensures
that all instructions are kept in a single place, instead of being
spread across different documents.

A minor downside is that CE and EE guidelines now live in the same
document, which could cause merge conflicts. Since we are working
towards a single codebase, this should only be an issue until we merge
the codebases together; something we expect to do in the coming months.

This commit also removes all old upgrading instructions, but these can
still be accessed using Git branch specific URLs (included in the
updating README).

New Crowdin translations

See merge request gitlab-org/gitlab-ee!9510

Remove HipChat integration from GitLab

Closes #52424

See merge request gitlab-org/gitlab-ce!22223