Support else completion for more expressions #37097

Job	Run time
proc-macro-srv	1m 42s
changes	5s
analysis-stats	11m 53s
Rust (ubuntu-latest)	5m 38s
Rust (macos-latest)	8m 33s
Rust Cross (x86_64-unknown-linux-musl)	1m 19s
miri	38s
rustfmt	11s
Rust (windows-latest)	8m 14s
Rust Cross (wasm32-unknown-unknown)	52s
Rust Cross (powerpc-unknown-linux-gnu)	1m 25s
Typo Check	7s
TypeScript	0s
cancel-if-matrix-failed	3s
conclusion	3s
	40m 43s

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