Fix meo.pt and nostv.pt grabbers

[CyberPoison]

Description

This PR updates the grabbers for meo.pt and nostv.pt to adapt to recent API changes. Both providers were updated to use new endpoints and data structures.

Changes

meo.pt

• API Update: Switched to meogouser.apps.meo.pt endpoints.
• Method: Changed requests from POST to GET with appropriate headers.
• Parser: Updated logic to handle the new JSON structure (using Result array and flattened program properties).
• Tests: Updated unit tests and mock data (data/content.json) to reflect the new API response.
• Fixes: Resolved linting issues (unused variables).

nostv.pt

• API Update: Switched to api.clg.nos.pt endpoints for both channels and schedule.
• Auth: Added required headers (including x-apikey and x-core-appversion) to authenticate requests.
• Parser: Updated logic to extract program details from the new Metadata object structure.
• Tests: Updated unit tests and mock data (data/data.json).
• Fixes: Fixed linting errors (quote styles and unused variables).

Verification

• npm test -- sites/meo.pt/meo.pt.test.js passed.
• npm test -- sites/nostv.pt/nostv.pt.test.js passed.
• Validated XML generation for both sites.