handle equivalent/identical repos with different URLs

[milo-minderbinder]

Add support for handling & configuring multiple repository URLs that point to repos that are identical/equivalent. For example, https://repo1.maven.org/maven2/ and https://repo.maven.apache.org/maven2/ both point to the same repository on the back end. If the internal artifactory instance only has a local mirror pointing to https://repo1.maven.org/maven2/, and the gradle build lists https://repo.maven.apache.org/maven2/ in its repositories, it should still replace it with the internal mirror URL. If there are internal mirrors for both remote URLs, then the one with the exact matching URL should be used.