Promote ServiceExternalIP to beta #35213

Job	Run time
Check whether tests need to be run based on diff	15s
Verify docs and spelling	1m 53s
Go benchmark test	5m 26s
Build Antrea and antctl binaries	13m 31s
Golangci-lint (ubuntu-latest)	9m 31s
Golangci-lint (macos-latest)	9m 56s
Integration test	5m 40s
Unit test (ubuntu-latest)	7m 33s
Unit test (windows-2022)	14m 31s
Check tidy, code generation and manifest	4m 41s
Build Antrea Windows binaries	2m 16s
	1h 15m 13s

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