Fix nested fully computed properties showing as settable

[VenelinMartinov]

Fix nested fully computed properties showing as settable

repros

[VenelinMartinov]

This change is part of the following stack:

• Fix PF WriteOnly attributes skip #3043
  • Fix required properties with default in TF projecting as non-optional in Pulumi #3035
    • Fix nested fully computed properties showing as settable #3044 ◀

_{Change managed by git-spice.}

[codecov]

Codecov Report

Attention: Patch coverage is 48.75000% with 41 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@31a6c1e). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...testprovider/schema_required_input_with_default.go	0.00%	20 Missing ⚠️
.../internal/testprovider/optionalinputwithdefault.go	0.00%	15 Missing ⚠️
pkg/pf/internal/pfutils/default.go	78.57%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3044   +/-   ##
=======================================
  Coverage        ?   34.93%           
=======================================
  Files           ?      316           
  Lines           ?    42081           
  Branches        ?        0           
=======================================
  Hits            ?    14701           
  Misses          ?    25945           
  Partials        ?     1435           

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