feat: Send state event to timeline on creating new megolm session #2042

Job	Run time
app_jobs / dart_web_compatible	58s
app_jobs / coverage_without_olm	2m 2s
app_jobs / coverage	2m 7s
app_jobs / database_web_tests	38s
app_jobs / e2ee_test (synapse)	1m 58s
app_jobs / pub-dev-dry-run	26s
app_jobs / e2ee_test (dendrite)	2m 0s
dart / dart_analyzer	38s
general / conventional_commits	4s
app_jobs / e2ee_test (conduit)	2m 0s
app_jobs / merge_converage	28s
app_jobs / review_app_coverage / deploy_review_app	7s
app_jobs / review_app_coverage / cleanup_review_app	9s
app_jobs / review_app_coverage / qa_app	0s
	13m 35s

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