Description of problem:

In Extensions plugin, only the first package configuration is honoured and others are ignored.

I have a setup where my plugin has two packages and configurations are defined in both the packages `red-hat-developer-hub-backstage-plugin-lightspeed` and `red-hat-developer-hub-backstage-plugin-lightpseed-backend` but only the first package configuration is surfaced in the UI and clicking on Apply button patches only the first package.

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

1. Use a plugin with multiple packages and have different configurations for each packages in `appConfigExamples` field.

Actual results:

Only first configuration is applied to the first package.

Expected results:

Should support multiple package configurations.

Reproducibility (Always/Intermittent/Only Once):

Always

Build Details:

rhdh:next (main branch).

Additional info (Such as Logs, Screenshots, etc):