[FEAT]: Add Support for GitHub Enterprise Rulesets

[Ravio1i]

Resolves #2666

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Before the change?

No possibility to create or fetch rulesets at enterprise level

After the change?

• Create rulesets with resource
• Fetch rulesets with datasource

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

Notes

• Tested with own GitHub Enterprise Cloud Instance
• Currently there is a race condition in the test testAccGithubEnterpriseRuleset_required_workflows: Error running post-test destroy, there may be dangling resources for vulnerability-alerts`. The test still works but the vulnerabtily alert seems to be not finished in time. Happy to hear feedback about this

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[github-actions]

👋 Hi! Thank you for this contribution! Just to let you know, our GitHub SDK team does a round of issue and PR reviews twice a week, every Monday and Friday! We have a process in place for prioritizing and responding to your input. Because you are a part of this community please feel free to comment, add to, or pick up any issues/PRs that are labeled with Status: Up for grabs. You & others like you are the reason all of this works! So thank you & happy coding! 🚀

[Ravio1i]

Closed PR from my Personal Account in favor of coming from Siemens