MSA-15087: 🚑 Get profile by ref

[Vignaudo]

No description provided.

[Copilot]

Pull request overview

This PR refactors the profile existence check from a POST-based API call to a GET-based one, updating both the implementation and its corresponding test. The change aligns with RESTful principles where GET requests should be used for read-only operations.

Key changes:

• Changed the exist() method in Profile class from using POST (_call_post()) to GET (_call_get())
• Updated the API endpoint from /profile/v1/exist/{reference} to /profile/ref?extRef={reference}
• Modified the return logic to check HTTP status code (200) instead of parsing JSON response
• Added type hints to MSA_API class attributes and methods for better type safety
• Added null-safety check in check_response() method to prevent potential AttributeError

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
tests/test_profie.py	Updated test to mock _call_get instead of _call_post and verify the new API endpoint format
msa_sdk/profile.py	Refactored exist() method to use GET request and check status code instead of parsing JSON response
msa_sdk/msa_api.py	Added type annotations for better type safety and added null-check in check_response() to handle None responses

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