chore: use testcontainers

[miparnisari]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 90.37433% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.25%. Comparing base (3fa88f3) to head (1495951).

Files with missing lines	Patch %	Lines
internal/testserver/datastore/spanner.go	80.00%	6 Missing and 1 partial ⚠️
internal/testserver/datastore/mysql.go	85.72%	4 Missing and 1 partial ⚠️
internal/testserver/datastore/crdb.go	93.62%	2 Missing and 1 partial ⚠️
internal/testserver/datastore/postgres.go	95.72%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2782      +/-   ##
==========================================
- Coverage   77.72%   75.25%   -2.47%     
==========================================
  Files         472      472              
  Lines       49707    49727      +20     
==========================================
- Hits        38631    37416    -1215     
- Misses       8228     9494    +1266     
+ Partials     2848     2817      -31     

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