chore: redirect to core lib for runtime actions

[moritzraho]

Description

The @adobe/aio-lib-core-auth library should be preferred in the Runtime action context:

• it focuses on generating OAuth tokens, doesn't rely on the complex context/plugin logic used for the CLI and doesn't bring the deprecated JWT tokens logic.
• it relies on in-memory caching instead of external State storage, which comes with its own usage limits.
• @adobe/aio-lib-ims relies on the technical_account_id and technical_account_email fields. Those fields are not needed to generate the token.

Related Issue

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 change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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