* Deprecate legacy sled store
* Add e2ee test
* Add support for e2ee testing in e2e environment
* Tidy up redis support
* Attempt to get test working
* cleanup test
* opportunistic lint
* tiny bit of cleanup
* remove ref
* tweak to homerunner
* switch to nightly images for Synapse (to test E2EE)
* use nightly
* newsfile.
* Update bot sdk to support authenticated media (now that Synapse requires it)
* fix typings
* MatrixError
* one more
* Graduate the encryption property to stable.
* update test config
* Update encryption docs.
* fix some old config bits
