Fix- 1036 - path paramter endpoint save failure

[ruwinirathnamalala]

This pull request refines how endpoint URLs and parameters are constructed before making API requests. The main change is improved handling of path and query parameters, ensuring that path parameters are correctly encoded into the URL and that only query parameters are included in the params object. This makes the request construction more robust and accurate.

Improvements to endpoint request construction:

• Path parameters are now detected and safely encoded directly into the URL, replacing placeholders with their actual values.
• Query parameters are separated from path parameters and are the only ones included in the params object sent with the request.
• The code now avoids including undefined or empty path parameter values, improving request reliability.

[sonarqubecloud]

Quality Gate failed

Failed conditions
B Maintainability Rating on New Code (required ≥ A)

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[ruwinirathnamalala]

The structuredClone approach failed with DataCloneError because flow nodes contain function references (onDelete, onEdit, setClickedNode, update), which cannot be cloned by the structured clone algorithm. The JSON.parse(JSON.stringify()) method is used here to strip functions from nodes before saving to history, which are then manually re-attached during undo/redo operations.
Therefore, ignore the Sonar issue warning in the PR