feat: store richtext data as HTML rather than a Prosemirror tree #3279

Job	Run time
path-filter	6s
ci / ci (lint)	1m 16s
build-all / Emit container tag sha	5s
ci / ci (type-check)	1m 30s
ci / ci (format)	55s
ci / ci (test-run)	1m 48s
close-preview	0s
build-all / build-base / Build	3m 33s
build-all / build-core / Build	4m 23s
build-all / build-jobs / Build	1m 57s
deploy-docs-preview / build-docs	1m 35s
close-docs-preview	0s
e2e / Integration tests (core)	5m 11s
deploy-preview / preview	27s
e2e / Integration tests (context-editor)	5m 40s
status-check	4s
	28m 30s

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