Add const to tt_ClusterDescriptor's methods returning maps #400

Job	Run time
build-tests (blackhole) / Build umd_tests for blackhole on ubuntu-22.04	3m 20s
build-tests (grayskull) / Build umd_tests for grayskull on ubuntu-22.04	3m 21s
build-tests (blackhole) / Build umd_tests for blackhole on ubuntu-20.04	3m 0s
build-tests (wormhole_b0) / Build umd_tests for wormhole_b0 on ubuntu-22.04	3m 6s
build-tests (grayskull) / Build umd_tests for grayskull on ubuntu-20.04	2m 56s
build-tests (wormhole_b0) / Build umd_tests for wormhole_b0 on ubuntu-20.04	3m 6s
test-all (grayskull, e75, 10) / Run tests for grayskull on e75 on ubuntu-22.04	42s
test-all (wormhole_b0, n150, 5) / Run tests for wormhole_b0 on n150 on ubuntu-22.04	53s
test-all (grayskull, e150, 10) / Run tests for grayskull on e150 on ubuntu-22.04	40s
test-all (grayskull, e75, 10) / Run tests for grayskull on e75 on ubuntu-20.04	41s
test-all (wormhole_b0, n150, 5) / Run tests for wormhole_b0 on n150 on ubuntu-20.04	54s
test-all (grayskull, e300, 10) / Run tests for grayskull on e300 on ubuntu-22.04	39s
test-all (grayskull, e150, 10) / Run tests for grayskull on e150 on ubuntu-20.04	40s
test-all (grayskull, e300, 10) / Run tests for grayskull on e300 on ubuntu-20.04	40s
test-all (wormhole_b0, n300, 15) / Run tests for wormhole_b0 on n300 on ubuntu-22.04	6m 3s
test-all (wormhole_b0, n300, 15) / Run tests for wormhole_b0 on n300 on ubuntu-20.04	3m 38s
	34m 19s

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