Merge branch 'release-v1.68' into develop

changelog.d/13761.misc

-Tag traces with the instance name to be able to easily jump into the right logs and filter traces by instance.

changelog.d/13763.misc

-Add a stub Rust crate.

changelog.d/13765.misc

-Concurrently fetch room push actions when calculating badge counts. Contributed by Nick @ Beeper (@fizzadar).

changelog.d/13766.bugfix

-Fix a long-standing bug where the `cache_invalidation_stream_seq` sequence would begin at 1 instead of 2.

changelog.d/13769.misc

-Add a stub Rust crate.

changelog.d/13770.misc

-Update the script which makes full schema dumps.

changelog.d/13778.misc

-Add a stub Rust crate.

changelog.d/13780.misc

-Deduplicate `is_server_notices_room`.
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changelog.d/13784.misc

-Simplify the dependency DAG in the tests workflow.

changelog.d/13785.doc

-Add docs for common fix of deleting the `matrix_synapse.egg-info/` directory for fixing Python dependency problems.

changelog.d/13788.misc

-Remove an old, incorrect migration file.

changelog.d/13789.bugfix

-Fix a long-standing spec compliance bug where Synapse would accept a trailing slash on the end of `/get_missing_events` federation requests.
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changelog.d/13791.removal

-Don't include redundant `prev_state` in new events. Contributed by Denis Kariakin (@dakariakin).

changelog.d/13794.doc

-Update request log format documentation to mention the format used when the authenticated user is controlling another user.
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changelog.d/13795.misc

-Remove unused method in `synapse.api.auth.Auth`.

changelog.d/13798.misc

-Fix a memory leak when running the unit tests.
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changelog.d/13801.feature

-Add `listeners[x].request_id_header` config to specify which request header to extract and use as the request ID in order to correlate requests from a reverse-proxy.

changelog.d/13802.misc

-Use partial indices on SQLite.

changelog.d/13808.misc

-Check that portdb generates the same postgres schema as that in the source tree.

changelog.d/13810.feature

-Add an admin API endpoint to find a user based on its external ID in an auth provider.