[traceflow] Fix wrong TCP flags validation #31364

Job	Run time
Check whether tests need to be run based on diff	19s
Verify docs and spelling	57s
Integration test	4m 31s
Unit test (ubuntu-latest)	6m 20s
Unit test (windows-2022)	10m 38s
Go benchmark test	4m 38s
Build Antrea and antctl binaries	10m 33s
Golangci-lint (macos-latest)	7m 57s
Golangci-lint (ubuntu-latest)	7m 45s
Check tidy, code generation and manifest	5m 35s
Build Antrea Windows binaries	1m 46s
	1h 0m 59s

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