[airflow] Add lint rule to show error for removed context variables in airflow #38310

Job	Run time
python package	1m 43s
cargo fmt	45s
cargo build (release)	0s
Determine changes	10s
mkdocs	2m 41s
pre-commit	3m 5s
cargo clippy	1m 54s
cargo test (linux)	1m 50s
cargo build (msrv)	4m 9s
cargo test (linux, release)	4m 14s
cargo fuzz build	5m 25s
cargo test (wasm)	2m 5s
cargo test (windows)	5m 9s
benchmarks	5m 11s
cargo shear	23s
formatter instabilities and black similarity	0s
test scripts	1m 1s
test ruff-lsp	42s
ecosystem	2m 39s
fuzz parser	0s
	43m 6s

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