Re-enable Http2ClientReconnectTest - Need assistance from contributors

[velo]

Summary

This PR reverts the temporary disabling of Http2ClientReconnectTest in both feign-vertx and feign-vertx4-test modules.

The test was temporarily disabled in commit 196f282 to prevent build failures, but it should be properly fixed rather than left disabled.

Need for Assistance

@aklenin (Alexei KLENIN) - Could you please help investigate and fix the issues with the HTTP/2 reconnection tests? Based on the git history, you both have significant experience with this test code:

• Alexei implemented the original WebClient-based architecture in FEATURE: base feign-vertx on Vertx WebClient instead of bare vertx #2756
• Marvin has made several updates to the test infrastructure

Test Failures

The Http2ClientReconnectTest is currently experiencing issues that cause build failures. The test extends AbstractClientReconnectTest and specifically tests HTTP/2 reconnection scenarios with:

• Vertx WebClient with HTTP/2 protocol
• Connection pool size limits
• Jackson encoder/decoder integration

Action Items

• Investigate root cause of test failures
• Fix underlying issues with HTTP/2 reconnection logic
• Ensure tests pass consistently in CI
• Re-enable the tests

Any assistance in debugging and fixing these tests would be greatly appreciated!

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