pallet macro: Support instantiable pallets in tasks #11851

Job	Run time
check-dependency-rules	8s
check-fail-ci	11s
check-markdown	14s
check-workspace	21s
preflight / preflight	46s
preflight / ci-versions	1m 2s
check-toml-format	1m 1s
check-rust-feature-propagation	2m 27s
test-rust-features	2m 15s
check-umbrella	2m 38s
fmt	1m 36s
All quick checks passed	1s
	12m 40s

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