[Tanmay-Ts]

Issue number: closes #8597

Summary

Changes

• _get_parameters_by_name now catches any exception from the GetParameters request. With raise_on_error=True it raises GetParameterError (chained with from exc, so the botocore error is available as __cause__). With raise_on_error=False it returns the request's names, which end up under _errors.
• Previously only InvalidKeyId and InternalServerError were caught, so throttling or any other ClientError escaped raw in both modes.
• fix(parameters): raise GetParameterError when GetParameters fails in fail-fast mode #8616 already made InvalidKeyId and InternalServerError raise GetParameterError in fail-fast mode. This PR keeps its Failed to fetch parameters: [...] message and appends the botocore error, so the cause is visible without reading __cause__.
• Per-parameter failures reported in InvalidParameters are unchanged; only request-level failures are affected.
• This applies to every GetParameters request get_parameters_by_name makes: all-decrypt batches, non-decrypt batches, and the non-decrypted subset of a mixed batch. The decrypted subset of a mixed batch goes through get(), which already wraps errors.

Tests added in tests/functional/parameters/_boto3/test_utilities_parameters.py:

• Fail-fast: ThrottlingException, InvalidKeyId and InternalServerError, each with decrypt=False and decrypt=True, asserting GetParameterError and the exact Names / WithDecryption sent.
• Graceful: 11 parameters fetched in two chunks, the first returning one InvalidParameters entry and the second throttled. Asserts _errors == [invalid, throttled] and that the successful values are kept.

On current develop, the throttling cases and the graceful test fail because the ClientError escapes. The InvalidKeyId and InternalServerError cases already raise there since #8616 and fail only because the message doesn't name the error code. With this change, pytest tests/functional/parameters → 190 passed.

User experience

Before:

provider.get_parameters_by_name({"/a": {}})                        # raw botocore ClientError (throttling)
provider.get_parameters_by_name({"/a": {}}, raise_on_error=False)  # raw botocore ClientError (throttling)

After:

provider.get_parameters_by_name({"/a": {}})                        # GetParameterError
provider.get_parameters_by_name({"/a": {}}, raise_on_error=False)  # {"_errors": ["/a"]}

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Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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