feat: Add module connection string provider

[HofmeisterAn]

What does this PR do?

This PR adds a default connection string provider to the modules. The provider delegates the GetConnectionString() API to the module-specific method, ensuring all modules use a consistent approach to retrieving connection strings. For modules with multiple connection strings, only the primary connection string is resolved. Additional connection strings can be supported in future PRs using the named connection string feature (for this PR out-of-scope).

Why is it important?

-

Related issues

• Relates fead: Add default container connection string provider #1630

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/add-module-connection-string-provider

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