chore: [PAGOPA-3441] Update OPEX

[cap-ang]

List of Changes

• apim-v2 OPEX housekeeping;
• switch from app-gw to apim UAT OPEX

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• 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)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[github-actions]

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[github-actions]

Comment this PR with update_code to update openapi.json and format the code. Consider to use pre-commit to format the code.

[sonarqubecloud]

Quality Gate failed

Failed conditions
57.1% Coverage on New Code (required ≥ 80%)
B Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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