Test RandomBytes PF support

[t0yv0]

Small PR to cover support for resources without a proper ID like RandomBytes. To do this:

• upgraded localized pulumi-random provider to the version we actually use
• wrote a quick test
• discovered TFGen starts to generate (MISSING) into Description #1776
• worked around it for now by manually undoing its schema edits

[VenelinMartinov]

lgtm

[codecov]

Codecov Report

Attention: Patch coverage is 22.22222% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 59.46%. Comparing base (d744c5d) to head (e68bfb8).

Files	Patch %	Lines
pf/tests/internal/testprovider/random.go	22.22%	13 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1777      +/-   ##
==========================================
- Coverage   60.00%   59.46%   -0.54%     
==========================================
  Files         302      309       +7     
  Lines       42162    42558     +396     
==========================================
+ Hits        25299    25308       +9     
- Misses      15437    15823     +386     
- Partials     1426     1427       +1     

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