fix: add adjustments to ucc-test-modinput interface

[kdoroszko-splunk]

Description

This is an adaptation to the new interface of the ucc-test-modinput command. From now on ucc-test-modinput does not perform ucc-test-modinput gen by default, so it must be explicitly specified.

Checklist

• README.md has been updated or is not required
• push trigger tests
• manual release test
• automated releases test
• pull request trigger tests
• schedule trigger tests
• workflow errors/warnings reviewed and addressed

Testing done

• backward compatibility (versions lower than 1.0.0): https://github.com/splunk/splunk-add-on-for-google-cloud-platform/actions/runs/15323624242
• latest framework version (version 1.0.0): https://github.com/splunk/splunk-add-on-for-box/actions/runs/15325196621/job/43118599310

[srv-rr-github-token]

🎉 This PR is included in version 4.19.6 🎉

The release is available on GitHub release

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