Add antrea scale test tool #32944

Job	Run time
Verify docs and spelling	36s
Check whether tests need to be run based on diff	14s
Unit test (ubuntu-latest)	6m 43s
Integration test	12m 6s
Build Antrea and antctl binaries	10m 26s
Golangci-lint (macos-latest)	3m 31s
Golangci-lint (ubuntu-latest)	4m 18s
Unit test (windows-2022)	12m 22s
Check tidy, code generation and manifest	5m 32s
Build Antrea Windows binaries	2m 5s
Go benchmark test	4m 48s
	1h 2m 41s

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