Refactor providerbuilder Resource to apply defaults in NewResource

[VenelinMartinov]

This PR is a refactor of the test utilities in PF for creating Resources.

We now have a NewResource function to create pb.Resource which fills in reasonable defaults which were previously handled in NewProvider. This in turn will allow us to use pb.Resource as an argument in Diff cross-tests.

The concrete use case I am after with this is for Diff cross-tests for Computed properties, which require a custom Create and Update function.

[VenelinMartinov]

This change is part of the following stack:

• 2631

  • 2630 ◀

_{Change managed by git-spice.}

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.93%. Comparing base (a3ccb9f) to head (875ca0b). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2630 +/- ## ========================================== - Coverage 69.94% 69.93% -0.01% ========================================== Files 367 367 Lines 44522 44523 +1 ========================================== - Hits 31140 31138 -2 - Misses 11751 11753 +2 - Partials 1631 1632 +1 ```

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[pulumi-bot]

This PR has been shipped in release v3.96.0.