[mdatagen] Fix metric tests on boolean attributes (#11169) #8

Job	Run time
setup-environment	29s
govulncheck	1m 11s
test-coverage	8m 46s
checks	2m 1s
lint	3m 49s
cross-build-collector (darwin, amd64)	49s
cross-build-collector (darwin, arm64)	38s
unittest-matrix (ubuntu-latest, ~1.23)	5m 34s
cross-build-collector (linux, 386)	38s
unittest-matrix (ubuntu-latest, ~1.22)	5m 24s
cross-build-collector (linux, amd64)	47s
cross-build-collector (linux, arm64)	38s
cross-build-collector (linux, ppc64le)	45s
cross-build-collector (linux, arm, 7)	41s
cross-build-collector (linux, s390x)	43s
cross-build-collector (windows, 386)	39s
cross-build-collector (windows, amd64)	37s
unittest	1s
	34m 10s

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