Support simple ping mesh in agent. #32889

Job	Run time
Check whether tests need to be run based on diff	19s
Verify docs and spelling	36s
Unit test (windows-2022)	11m 4s
Unit test (ubuntu-latest)	6m 40s
Integration test	11m 55s
Build Antrea and antctl binaries	9m 53s
Golangci-lint (macos-latest)	4m 32s
Golangci-lint (ubuntu-latest)	7m 44s
Go benchmark test	4m 47s
Check tidy, code generation and manifest	5m 43s
Build Antrea Windows binaries	1m 52s
	1h 5m 5s

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