feat: Remove support for .NET 6.0, 7.0

[mtrezza]

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[parse-github-assistant]

Thanks for opening this pull request!

• ❌ Please link an issue that describes the reason for this pull request, otherwise your pull request will be closed. Make sure to write it as Closes: #123 in the PR description, so I can recognize it.

[mtrezza]

BREAKING CHANGE: Removes support for .NET 6.0, 7.0 as they have reached their end-of-life date.

[YBTopaz8]

When this passes. My new Request will to.
I only Target .NET 6 as per your suggestion.
After you merge this, my PR should work.

Alternatively, you can accommodate for the request only as well.
I'll be here if there's anything i should do.

[mtrezza]

With this PR we'll target .NET 8 as the new min. version. This is currently on hold until the other PRs are merged, so that anyone still using .NET 6 or 7 can benefit from as many fixes in #402 as possible. If there are parts of the PR that are require min .NET 8, we'll merge them after this PR. That's a good example for why it would be great if you could split #40 into individual PRs.

[YBTopaz8]

Done.
I fundamentally did 3 things

1. Fixed Tests (log out etc), PR is submitted
2. Fixed Relations. PR submitted (keep in mind it targets only .NET 6, should i update to only .NET 8?
3. Added more UT to hopefully increase coverage. Submitted as well !

[mtrezza]

That sounds good; as mentioned above, I think we should merge (2) and (3) before this PR if that is easily possible; so you can leave the PR for (2) targeting .NET 6.