tests(parameters): added missing tests for DynamoDBProvider

[dreamorosi]

Description of your changes

#1244 introduced integration tests for DynamoDBProvider, a provider part of the upcoming Parameters utility. At the time, the feature that allowed to inject a custom AWS SDK client was not present. The feature was added in #1222.

This PR adds some missing test cases to the integration tests of the provider to cover both the new feature, as well as testing cache and forceFetch behaviors.

How to verify this change

See checks under the PR as well as integration tests.

Note that the integration tests for the Parameters utility are not yet connected to the workflow, so here's a screenshot of a successful run from my local environment:

Related issues, RFCs

Issue number: #1272

PR status

Is this ready for review?: YES
Is it a breaking change?: NO

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding changes to the examples
• My changes generate no new warnings
• The code coverage hasn't decreased
• I have added tests that prove my change is effective and works
• New and existing unit tests pass locally and in Github Actions
• Any dependent changes have been merged and published
• The PR title follows the conventional commit semantics

Breaking change checklist

• I have documented the migration process
• I have added, implemented necessary warnings (if it can live side by side)

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