Clean up RichTextMultiselect feature flag #16056

Job	Run time
Compute workflow parameters	10s
Formatting + Clippy (Windows)	7m 29s
Run Windows tests	11m 44s
Formatting + Clippy (Linux)	5m 28s
Formatting + Clippy (MacOS)	5m 39s
Miscellaneous checks	1m 22s
Verify compilation with eval features	2m 9s
Run Linux tests	10m 25s
Verify compilation with release flags (Windows)	3m 21s
Verify compilation with release flags (Linux)	2m 28s
Run MacOS tests	19m 20s
Formatting + Clippy (wasm)	2m 30s
Verify compilation with release flags (wasm)	3m 41s
Verify compilation with release flags (MacOS)	3m 55s
Run Linux remote-server integration tests	0s
Database Migration (Diesel)	0s
Check CI results	4s
	1h 19m 45s

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