Tests

Use OpenAI Responses API for GitHub Copilot models that require it (g… #1106

Job	Run time
graalvm-build	5m 31s
unit-test (ubuntu-24.04, 24)	39s
unit-test (windows-latest, 24)	1m 46s
jvm-integration-test (ubuntu-24.04, 24)	2m 38s
jvm-integration-test (macos-latest, 24)	6m 8s
jvm-integration-test (windows-latest, 24)	4m 28s
unit-test (macos-latest, 24)	2m 3s
nix-build	7m 0s
graalvm-integration-test	56s
	31m 9s

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