RFR: 2069: Add group and collaborator methods to Forge and HostedRepository

[Magnus Ihse Bursie]

On Thu, 19 Oct 2023 21:19:35 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> This patch adds some new methods on Forge and HostedRepository to interact with forge groups and repository collaborators respectively. It also adds a lot more possible customization to the test class `CensusBuilder` as well as adding some missing `final` declarations in test classes. All the new API calls have manual tests added. It's quite large for what it is, but isn't really affecting any current production code.

Looks good to me.

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Marked as reviewed by ihse (Reviewer).

PR Review: https://git.openjdk.org/skara/pull/1573#pullrequestreview-1690007181