Maintenance: integration tests for `AppConfigProvider`

[dreamorosi]

Summary

As part of #1039, we need to implement integration tests for the AppConfigProvider which is part of the upcoming Parameters utility.

This issue is used to breakdown the larger epic and track progress in a more granular way.

Why is this needed?

To increase confidence around the utility behavior by testing it in a real AWS Lambda execution environment. And also to provide a baseline against potential future regressions.

Which area does this relate to?

Tests, Parameters

Solution

No response

Acknowledgment

• This request meets Lambda Powertools Tenets
• Should this be considered in other Lambda Powertools languages? i.e. Python, Java

[github-actions]

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