Add const to tt_ClusterDescriptor's methods returning maps #413

Job	Run time
build-tests (blackhole) / Build umd_tests for blackhole on ubuntu-22.04	3m 4s
build-tests (wormhole_b0) / Build umd_tests for wormhole_b0 on ubuntu-22.04	3m 11s
build-tests (grayskull) / Build umd_tests for grayskull on ubuntu-22.04	2m 55s
build-tests (blackhole) / Build umd_tests for blackhole on ubuntu-20.04	3m 2s
build-tests (wormhole_b0) / Build umd_tests for wormhole_b0 on ubuntu-20.04	3m 18s
build-tests (grayskull) / Build umd_tests for grayskull on ubuntu-20.04	3m 3s
test-all (grayskull, e300, 10) / Run tests for grayskull on e300 on ubuntu-22.04	1m 36s
test-all (grayskull, e150, 10) / Run tests for grayskull on e150 on ubuntu-22.04	1m 53s
test-all (wormhole_b0, n150, 5) / Run tests for wormhole_b0 on n150 on ubuntu-22.04	1m 14s
test-all (grayskull, e150, 10) / Run tests for grayskull on e150 on ubuntu-20.04	1m 55s
test-all (grayskull, e75, 10) / Run tests for grayskull on e75 on ubuntu-22.04	1m 45s
test-all (wormhole_b0, n150, 5) / Run tests for wormhole_b0 on n150 on ubuntu-20.04	1m 15s
test-all (grayskull, e75, 10) / Run tests for grayskull on e75 on ubuntu-20.04	1m 48s
test-all (grayskull, e300, 10) / Run tests for grayskull on e300 on ubuntu-20.04	1m 38s
test-all (wormhole_b0, n300, 15) / Run tests for wormhole_b0 on n300 on ubuntu-22.04	10m 49s
test-all (wormhole_b0, n300, 15) / Run tests for wormhole_b0 on n300 on ubuntu-20.04	11m 13s
	53m 39s

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