Remove solana-install support for channels since it is already broken. #8112

Job	Run time
check	0s
test	0s
cargo-test-sbf (token/program)	1m 52s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	1m 41s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	50s
cargo-test-sbf (token-upgrade/program)	34s
cargo-test-sbf (feature-proposal/program)	42s
cargo-test-sbf (governance/addin-mock/program, governance/program)	1m 39s
cargo-test-sbf (memo/program)	35s
cargo-test-sbf (name-service/program)	1m 43s
cargo-test-sbf (stake-pool/program)	1m 58s
cargo-test-sbf (single-pool/program)	47s
	12m 21s

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