fix: Propagate optional profile property from L3 to L1 constructs in atlas-basic-private-endpoint

[AgustinBettati]

Proposed changes

Cherry-picking changes from #485

Correctly propagates optional profile property from L3 to L1 constructs. Same pattern is seen in our other L3 resources (atlas-basic, atlas-basic-serverless-private-endpoint).

Type of change:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as
  expected)
• This change requires a documentation update

Required Checklist:

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have added any necessary documentation (if appropriate)
• I have run make fmt and formatted my code
• I have tested the CDK constructor in a CFN stack. See TESTING.md
• If changes include removal or addition of 3rd party GitHub actions, I updated our internal document. Reach out to the APIx Integration slack channel to get access to the internal document.

Further comments

[Copilot]

Pull Request Overview

This PR fixes a bug where the optional profile property was not being propagated from L3 to L1 constructs in the atlas-basic-private-endpoint resource, ensuring consistency with other L3 resources in the codebase.

• Adds missing profile property propagation to CfnPrivateEndpointService constructor
• Adds missing profile property propagation to CfnPrivateEndpoint constructor

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