feat: add ignore external keys feature

[Aenimus]

Summary by CodeRabbit

• New Features
  • Added a new feature flag enabling organizations to customize composition behavior regarding external key handling.

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/cosmo-docs.
• I have read the Contributors Guide.

[coderabbitai]

Walkthrough

The PR introduces a new feature flag COMPOSITION_IGNORE_EXTERNAL_KEYS_FEATURE_ID across the controlplane codebase. It adds a constant definition and extends the feature ID type union, then integrates the new flag into the organization features map with default configuration.

Changes

Cohort / File(s)	Summary
Feature Type Definition controlplane/src/types/index.ts	Introduces new constant COMPOSITION_IGNORE_EXTERNAL_KEYS_FEATURE_ID with value 'composition-ignore-external-keys' and extends the FeatureIds union type to include this feature ID with an inline comment reference.
Feature Integration controlplane/src/core/repositories/OrganizationRepository.ts	Imports the new feature constant and adds it to the getOrganizationFeatures method, including the flag in the default feature list with a false value. Adjusts field ordering and comments around boolean feature fields.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'feat: add ignore external keys feature' directly and clearly summarizes the main change: introducing a new feature flag for ignoring external keys in composition logic.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

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[codecov]

Codecov Report

❌ Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.25%. Comparing base (ea70e91) to head (873a67d).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ne/src/core/repositories/OrganizationRepository.ts	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            main    #2616       +/-   ##
==========================================
+ Coverage   1.40%   64.25%   +62.85%     
==========================================
  Files        296      301        +5     
  Lines      47245    42658     -4587     
  Branches     432     4558     +4126     
==========================================
+ Hits         662    27410    +26748     
+ Misses     46297    15227    -31070     
+ Partials     286       21      -265     

Files with missing lines	Coverage Δ
controlplane/src/types/index.ts	100.00% <100.00%> (ø)
...ne/src/core/repositories/OrganizationRepository.ts	77.37% <0.00%> (ø)

... and 595 files with indirect coverage changes

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