chore: add tests for the generated mapper.json file

[wilsonrivera]

@coderabbitai summary

Checklist

• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.
• Documentation has been updated on https://github.com/wundergraph/docs-website.
• I have read the Contributors Guide.

Open Source AI Manifesto

This project follows the principles of the Open Source AI Manifesto. Please ensure your contribution aligns with its principles.

The goal of this PR is to add tests to ensure that the contents of the generated mapper.json file is correct.

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[codecov]

Codecov Report

❌ Patch coverage is 88.52459% with 203 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (wilson/eng-9541@58ae025). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...ntrolplane/src/core/services/CompositionService.ts	90.73%	78 Missing ⚠️
...rvices/graph/setGraphRouterCompatibilityVersion.ts	17.85%	21 Missing and 2 partials ⚠️
.../src/core/repositories/FederatedGraphRepository.ts	87.85%	17 Missing ⚠️
...core/bufservices/feature-flag/updateFeatureFlag.ts	82.85%	12 Missing ⚠️
...e/bufservices/federated-graph/migrateFromApollo.ts	0.00%	11 Missing ⚠️
.../src/core/bufservices/monograph/updateMonograph.ts	8.33%	11 Missing ⚠️
...vices/federated-graph/createFederatedGraphToken.ts	0.00%	10 Missing ⚠️
controlplane/src/core/composition/composer.ts	56.52%	10 Missing ⚠️
...lplane/src/core/repositories/SubgraphRepository.ts	87.65%	10 Missing ⚠️
...core/bufservices/feature-flag/createFeatureFlag.ts	82.75%	5 Missing ⚠️
... and 12 more

Additional details and impacted files

@@                Coverage Diff                 @@
##             wilson/eng-9541    #2850   +/-   ##
==================================================
  Coverage                   ?   64.52%           
==================================================
  Files                      ?      318           
  Lines                      ?    45114           
  Branches                   ?     4879           
==================================================
  Hits                       ?    29108           
  Misses                     ?    15981           
  Partials                   ?       25           

Files with missing lines	Coverage Δ
...ntrolplane/src/core/bufservices/PlatformService.ts	83.08% <100.00%> (ø)
...src/core/bufservices/monograph/publishMonograph.ts	64.00% <100.00%> (ø)
...lane/src/core/bufservices/subgraph/moveSubgraph.ts	84.70% <100.00%> (ø)
...ne/src/core/bufservices/subgraph/updateSubgraph.ts	83.88% <100.00%> (ø)
...ane/src/core/repositories/FeatureFlagRepository.ts	86.83% <100.00%> (ø)
controlplane/src/db/models.ts	100.00% <ø> (ø)
controlplane/src/db/schema.ts	100.00% <100.00%> (ø)
controlplane/src/types/index.ts	100.00% <100.00%> (ø)
...ne/src/core/bufservices/contract/createContract.ts	77.45% <95.23%> (ø)
...ne/src/core/bufservices/contract/updateContract.ts	77.14% <97.61%> (ø)
... and 20 more

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[wilsonrivera]

It have been cancelled in favor of #2854