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feat(mangen): Support flatten_help #5943

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Job	Run time
Shell Integration	39s
Minimal versions	24s
lockfile	10s
Check (msrv)	18s
Nushell Integration	51s
Check (wasm)	11s
Test (linux)	1m 31s
Check (wasm-wasi)	9s
UI Tests (default)	24s
Test (windows)	6m 3s
Check (debug)	28s
UI Tests (next)	22s
Test (mac)	1m 57s
Check (release)	30s
Test (minimal)	1m 0s
Test (default)	1m 42s
Test (next)	1m 15s
cffconvert	10s
clippy	50s
Docs	23s
rustfmt	13s
CI	1s
	19m 31s