Add tests for getCredentials with multiple goproxy_servers and maven_… #7574

Job	Run time
Ruby analysis (ubuntu-latest, default)	50s
Ruby analysis (ubuntu-latest, nightly-latest)	50s
Ruby analysis (macos-latest, default)	53s
Ruby analysis (macos-latest, nightly-latest)	59s
Ruby analysis (macos-latest, linked)	1m 14s
Ruby analysis (ubuntu-latest, linked)	43s
	5m 29s

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