fix: declare and register regctl toolchains only for compatible platf… #1570

Job	Run time
matrix-prep-bazelversion	4s
matrix-prep-os	1s
test (ubuntu-latest, 7.1.1, ., true)	5m 15s
test (ubuntu-latest, 7.1.1, ., false)	2m 13s
test (ubuntu-latest, 7.1.1, e2e/wasm, false)	4m 14s
test (ubuntu-latest, 7.1.1, e2e/smoke, true)	2m 30s
test (ubuntu-latest, 7.1.1, e2e/smoke, false)	19s
test (ubuntu-latest, 7.1.1, e2e/assertion, true)	4m 41s
test (ubuntu-latest, 6.4.0, ., true)	2m 50s
test (ubuntu-latest, 6.4.0, ., false)	5m 43s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	3m 3s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	15s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	2m 27s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	4m 36s
test (macos-13, 7.1.1, ., true)	4m 45s
test (macos-13, 7.1.1, ., false)	7m 31s
test (macos-13, 7.1.1, e2e/smoke, true)	42s
test (macos-13, 7.1.1, e2e/smoke, false)	2m 55s
	54m 4s

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