Make TaskHandler::handle() more generalized #14910

Job	Run time
cargo-test-sbf (token/program)	7m 8s
check	2m 16s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	15m 56s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	12m 50s
test (single-pool/cli, single-pool/program)	14m 5s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 14s
test (token-upgrade/cli, token-upgrade/program)	12m 56s
cargo-test-sbf (token-upgrade/program)	7m 26s
cargo-test-sbf (feature-proposal/program)	6m 24s
cargo-test-sbf (governance/addin-mock/program, governance/program)	10m 10s
cargo-test-sbf (name-service/program)	6m 12s
cargo-test-sbf (stake-pool/program)	9m 48s
cargo-test-sbf (single-pool/program)	10m 5s
	2h 4m 30s

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