Add tests for getCredentials with multiple goproxy_servers and maven_… #601

Job	Run time
Analysis kinds (ubuntu-latest, linked, code-quality)	57s
Analysis kinds (ubuntu-latest, nightly-latest, code-quality)	54s
Analysis kinds (ubuntu-latest, nightly-latest, code-scanning,code-quality)	1m 9s
Analysis kinds (ubuntu-latest, linked, code-scanning)	1m 3s
Analysis kinds (ubuntu-latest, linked, code-scanning,code-quality)	1m 3s
Analysis kinds (ubuntu-latest, linked, risk-assessment)	1m 1s
Analysis kinds (ubuntu-latest, nightly-latest, risk-assessment)	1m 2s
Analysis kinds (ubuntu-latest, nightly-latest, code-scanning)	1m 0s
	8m 9s

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