Rate Limit Exceeded on EFSMountTarget

[dimizuno]

We are running into rate limit issues with EFSMountTarget and sometimes EFSFileSystem (although that seems to be more rare and more stable).

time="2025-10-29T15:42:25+01:00" level=error msg="listing failed:\n    ThrottlingException: Rate exceeded\n    {\n      RespMetadata: {\n        StatusCode: 400,\n        RequestID: \"cbef3777-35f3-4940-9968-9434ad77b8df\"\n      },\n      Message_: \"Rate exceeded\"\n    }" error="ThrottlingException: Rate exceeded\n{\n  RespMetadata: {\n    StatusCode: 400,\n    RequestID: \"cbef3777-35f3-4940-9968-9434ad77b8df\"\n  },\n  Message_: \"Rate exceeded\"\n}" owner=eu-central-1 resource_type=EFSMountTarget

It seems like a fix/mitigation for EFSFileSystem was implemented in #407 but it was not done for EFSMountTarget, although the same API call is used here.