Fix spurious diffs for updates in renderYaml mode

[rquitales]

Proposed changes

Always store newInputs to avoid spurious diffs in renderYaml updates. Storing oldLive in state will result in the Pulumi state never updating after the initial create.

Testing: added a new step within the TestRenderYAML that exercises the update flow. This test fails without the changes in this PR.

Related issues (optional)

Fixes: #3026

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 36.43%. Comparing base (41b0d90) to head (e18a0a9).

Files	Patch %	Lines
provider/pkg/provider/provider.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3030   +/-   ##
=======================================
  Coverage   36.43%   36.43%           
=======================================
  Files          70       70           
  Lines        9167     9167           
=======================================
  Hits         3340     3340           
  Misses       5497     5497           
  Partials      330      330           

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