Run matrix-react-sdk tests on merge queue (#3161)
* First attempt at merge queues for downstream testing
* Debug
* delint
* Fix typo
* Test
* Iterate
* Fix checkout
* rerun
* experiment
* Iterate
* Iterate
* iterate
* Iterate
* Finalise
* Disable coverage for downstream tests
* Update tests.yml
* Apply merge_queue trigger to other CI
* delint
* delint
* Add exception
