[thebadalov]

Summary

When getParametersByName received a mix of parameters with and without decrypt: true, the decrypted ones were fetched through the raw _get(), so the transform was not applied and the values were never cached. This PR routes them through get(), so they get the same transform and cache handling as every other parameter.

Changes

• Call this.get() instead of this._get() in SSMProvider.getParametersByNameWithDecryptOption, and note in its JSDoc that the transform and cache options apply to each parameter.
• Add the two unit tests suggested in the issue to SSMProvider.test.ts: one checks that the transform is applied to the decrypted parameters, the other that they are served from the cache on the next call.
• Since the values now go through get(), an SDK error on this path is wrapped in GetParameterError, as it already is on the other paths.

Issue number: closes #5831

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[powertools-for-aws-oss-automation]

Awesome work, congrats on your first merged pull request and thank you for helping improve everyone's experience!