fix(secret): set project_id as optional in datasources

[Codelax]

Fix #2737

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.12%. Comparing base (fe86049) to head (64e805d).
Report is 174 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/services/secret/helpers.go	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2738      +/-   ##
==========================================
- Coverage   71.43%   71.12%   -0.32%     
==========================================
  Files         277      336      +59     
  Lines       35875    33832    -2043     
==========================================
- Hits        25628    24063    -1565     
+ Misses       8028     7439     -589     
- Partials     2219     2330     +111     

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