Move build to .NET 8 preview 6

[SteveL-MSFT]

PR Summary

Errors were from additional method analysis that methods not using instance data should be marked as static. Addressed all the reported errors.

Constructor for a marshaled type has to be public due to breaking change in .NET 8.

Needed to rev isolation test module to use 13.0.0.1 of NewtonSoft as anything older gets flagged due to a security issue. Changed test to check file location instead of version.

Removed win-arm build as some assemblies for .NET 8 don't appear to be published for win-arm anymore since .NET dropped support for it.

PR Context

Moving to .NET 8 preview 6

PR Checklist

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[daxian-dbw]

LGTM

Dismiss my review as more changes were pushed.

[SteveL-MSFT]

The Windows xunit test issue is a known issue with MMI.dll and .NET 8 newer previews. I believe @adityapatwardhan has a workaround.

[TravisEz13]

looked at changes

[microsoft-github-policy-service]

This pull request has been automatically marked as Review Needed because it has been there has not been any activity for 7 days.
Maintainer, please provide feedback and/or mark it as Waiting on Author

[adityapatwardhan]

@SteveL-MSFT - please look at CI failures

[pull-request-quantifier-deprecated]

This PR has 74 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

---

Quantification details

Label      : Small
Size       : +27 -47
Percentile : 29.6%

Total files changed: 19

Change summary by file extension:
.yml : +0 -15
.json : +1 -1
.cs : +24 -30
.csproj : +2 -1

Change counts above are quantified counts, based on the PullRequestQuantifier customizations.

Why proper sizing of changes matters

Optimal pull request sizes drive a better predictable PR flow as they strike a
balance between between PR complexity and PR review overhead. PRs within the
optimal size (typical small, or medium sized PRs) mean:

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    iterations.
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• Review quality is likely higher as complexity is lower:
  • Bugs are more likely to be detected.
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  • Small portions can be assimilated better.
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What can I do to optimize my changes

• Use the PullRequestQuantifier to quantify your PR accurately
  • Create a context profile for your repo using the context generator
  • Exclude files that are not necessary to be reviewed or do not increase the review complexity. Example: Autogenerated code, docs, project IDE setting files, binaries, etc. Check out the Excluded section from your prquantifier.yaml context profile.
  • Understand your typical change complexity, drive towards the desired complexity by adjusting the label mapping in your prquantifier.yaml context profile.
  • Only use the labels that matter to you, see context specification to customize your prquantifier.yaml context profile.
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How to interpret the change counts in git diff output

• One line was added: +1 -0
• One line was deleted: +0 -1
• One line was modified: +1 -1 (git diff doesn't know about modified, it will
  interpret that line like one addition plus one deletion)
• Change percentiles: Change characteristics (addition, deletion, modification)
  of this PR in relation to all other PRs within the repository.

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[daxian-dbw]

LGTM

[Moazzem-Hossain-pixel]

Need support to resolve this issue.

[Moazzem-Hossain-pixel]

If you can take the needed initiative for resolving this issue that will be highly appreciated.

Regards,