Workaround so that tests elaborate under a trimmed configuration. Skip building the TestProvider and associated TestAction when TestConfiguration is unavailable (e.g. test target is under a dep of a non-test target). Only the top-level cares (or, really, should care) about TestProvider or TestAction and thus test targets at the top-level will not have had their TestConfiguration trimmed by an intervening non-test target. Test targets depended on by a non-test target will see a trimmed configuration without TestConfiguration but still be able to return the other non-TestProvider providers. Note: --trim_test_configuration will still misbehave if a config_setting nested under a non-test dep tries to read from the TestConfiguration (e.g. "test_arg"). However, reading from TestConfiguration in general is EXTREMELY rare with <10 instances. RELNOTES: --trim_test_configuration should work for almost all cases when a non-test target depends on a test. PiperOrigin-RevId: 332262714
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