Make `--config` and `--isolated` global flags #25343

Job	Run time
Determine changes	9s
cargo fmt	12s
pre-commit	1m 3s
mkdocs	1m 55s
python package	1m 13s
cargo test (linux)	3m 39s
benchmarks	4m 43s
cargo fuzz	5m 14s
cargo clippy	1m 59s
cargo test (wasm)	1m 19s
cargo test (windows)	6m 3s
cargo udeps	1m 55s
formatter instabilities and black similarity	3m 30s
test scripts	52s
test ruff-lsp	15s
ecosystem	13m 33s
	47m 34s

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