fix(profiling): Skip Docker-dependent validation tests gracefully when Docker unavailable

Use @testcontainers(disabledWithoutDocker = true) to automatically skip OtlpCollectorValidationTest when Docker is not available instead of failing with IllegalStateException.

This allows the test suite to pass cleanly in environments without Docker while still running all other tests. When Docker is available, these tests will run normally.

Result: 82 tests pass, Docker tests gracefully skipped when unavailable.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: jbachorik

dd-java-agent/agent-profiling/profiling-otel/src/test/java/com/datadog/profiling/otel/validation/OtlpCollectorValidationTest.java

@@ -43,9 +43,11 @@
  * <p><b>OTLP Profiles Status:</b> As of 2024, OTLP profiles is in Development maturity. The OTel
  * Collector may not fully support profiles yet, so these tests validate that the collector can at
  * least accept and deserialize our protobuf messages without errors.
+ *
+ * <p><b>Docker Requirement:</b> If Docker is not available, these tests will be skipped gracefully.
  */
 @Tag("otlp-validation")
-@Testcontainers
+@Testcontainers(disabledWithoutDocker = true)
 class OtlpCollectorValidationTest {
 
   @TempDir Path tempDir;