devops: Don't collect code coverage in test-install.yml #1539

Job	Run time
build-amd64 / linux/amd64	2m 39s
test-amd64 (aiida-core-base) / test	1m 38s
test-amd64 (aiida-core-dev) / test	2m 33s
test-amd64 (aiida-core-with-services) / test	1m 19s
build / linux/amd64,linux/arm64	1s
test-arm64	1s
publish-ghcr	1s
publish-dockerhub	1s
	8m 13s

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