refactor: encapsulate TyLoweringContext usage in hir-ty #39125

Job	Run time
clippy	1m 23s
Rust (macos-latest)	4m 46s
analysis-stats	7m 10s
proc-macro-srv	1m 28s
changes	5s
rustfmt	12s
Rust Cross (wasm32-unknown-unknown)	45s
Rust (windows-latest)	8m 4s
Rust (ubuntu-latest)	4m 53s
Typo Check	7s
Rust Cross (powerpc-unknown-linux-gnu)	1m 20s
Rust Cross (x86_64-unknown-linux-musl)	1m 18s
miri	43s
TypeScript	0s
conclusion	3s
cancel-if-matrix-failed	2s
	32m 19s

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