fix(parameter): improve AppConfig cached configuration retrieval

[leandrodamascena]

Issue number: #3194

Summary

Changes

This pull request fix an issue related to AppConfig caching behavior when multiple configuration calls are made using the same application/environment.

The expected behavior of get_latest_configuration function is to return a None/null value when no new configuration is available. This design is intentional and value should be cached on the customer side. We created a dictionary for storing the most recently retrieved value for a specific configuration profile.

For additional context and details regarding the behavior of get_latest_configuration, please refer to the official AWS AppConfig documentation.

User experience

There is no change in the user experience, but it fixes the error.

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• Meet tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Disclaimer: We value your time and bandwidth. As such, any pull requests created on non-triaged issues might not be successful.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (5bfb60f) 95.96% compared to head (c567ff0) 95.96%.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3195   +/-   ##
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  Coverage    95.96%   95.96%           
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  Files          195      195           
  Lines         8387     8387           
  Branches      1563     1563           
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  Hits          8049     8049           
  Misses         276      276           
  Partials        62       62           

Files	Coverage Δ
...ambda_powertools/utilities/parameters/appconfig.py	94.59% <100.00%> (ø)

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[heitorlessa]

Tiny changes - LGTM!!

1. Update PR body - what's the problem of making multiple calls? This will help improve the PR title in the Changelog too

2. Code comment on why we need to store last returned as a dict

3. Create an issue to add a E2E test after the release (non-blocking) so we can be confident there's no regression in the future

[rubenfonseca]

Looking at this now

[rubenfonseca]

Just left one tiny thing, but it's ready to go!

Heitor is away

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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