internal/civisibility/integrations/gotesting: add the `DD_CIVISIBILIT… #1115

Job	Run time
multios-unit-tests (macos-latest, 1.22) / test-multi-os	2m 0s
multios-unit-tests (macos-latest, 1.23) / test-multi-os	2m 36s
multios-unit-tests (ubuntu-latest, 1.22) / test-multi-os	5m 8s
multios-unit-tests (ubuntu-latest, 1.23) / test-multi-os	9m 31s
multios-unit-tests (windows-latest, 1.22) / test-multi-os	6m 15s
multios-unit-tests (windows-latest, 1.23) / test-multi-os	8m 3s
unit-integration-tests (1.22) / copyright	12s
unit-integration-tests (1.22) / lint	1m 45s
unit-integration-tests (1.22) / test-contrib	5m 39s
unit-integration-tests (1.22) / test-core	3m 17s
unit-integration-tests (1.23) / copyright	12s
unit-integration-tests (1.23) / lint	1m 33s
unit-integration-tests (1.23) / test-contrib	5m 59s
unit-integration-tests (1.23) / test-core	3m 29s
	55m 39s

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