Pass `--accept-flake-config` only during flake-related commands #1414

Job	Run time
main (x86_64-linux, false)	3m 42s
main (aarch64-darwin, false)	6m 35s
static-binary-check (ubuntu-latest)	3s
website	0s
static-binary-check (macos-latest)	6s
	10m 26s

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