Only enable terminal colors when supported #493

Job	Run time
Java tests (swift:6.0.2 jdk:Corretto os:jammy)	8m 9s
Verify Samples (swift:6.0.2 jdk:Corretto os:jammy)	17m 24s
Swift tests (swift:6.0.2 jdk:Corretto os:jammy)	4m 50s
soundness / Unacceptable language check	5s
soundness / License headers check	6s
soundness / Documentation check	37s
soundness / API breakage check	0s
soundness / Broken symlinks check	2s
soundness / Shell check	33s
soundness / YAML lint check	4s
soundness / Format check	0s
soundness / Python lint check	6s
	31m 56s

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