refactor: Use Event instead of EventUpdate for storing in db #1984

Job	Run time
app_jobs / dart_web_compatible	1m 2s
app_jobs / database_web_tests	33s
app_jobs / coverage_without_olm	2m 10s
app_jobs / coverage	2m 22s
app_jobs / e2ee_test (synapse)	1m 55s
dart / dart_analyzer	48s
app_jobs / pub-dev-dry-run	25s
app_jobs / e2ee_test (dendrite)	1m 49s
general / conventional_commits	6s
app_jobs / e2ee_test (conduit)	1m 50s
app_jobs / merge_converage	12s
app_jobs / review_app_coverage / qa_app	0s
app_jobs / review_app_coverage / cleanup_review_app	5s
app_jobs / review_app_coverage / deploy_review_app	10s
	13m 27s

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