Print which SSM parameter was not found

[xmik]

Without this PR

When we have the following resource in the manifest.yaml:

- name: SomeIAMRole
  resource_file: templates/some-iam-role.template
  parameters:
    - parameter_key: "param1"
      parameter_value: "$[alfred_ssm_/my/path/to/param1]"
    - parameter_key: "param2"
      parameter_value: "$[alfred_ssm_/my/path/to/param2]"

and a SSM parameter does not exist, we get the following error:

An error occurred (ParameterNotFound) when calling the GetParameter operation:

And in result, we don't know which SSM Parameter is not found.

With this PR

The error would be:

The following SSM Parameter was not found:  /my/path/to/param2
An error occurred (ParameterNotFound) when calling the GetParameter operation:

This will make troubleshooting easier.

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[groverlalit]

Thanks creating the pull request. We have added this to our backlog.

[aijunpeng]

This issued has been fixed.