HubContent and ImageVersion does not have `get_all()` methods

[benieric]

Describe the bug
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When running codegen, can see some warnings that HubContent and ImageVersion do not have get_all() methods.

[04/15/25 10:50:54] WARNING  Resource HubContent summaries do not have required members to create object instance. Resource may require custom key mapping for get_all().                                                                                            resources_codegen.py:1766
                             List HubContentInfo Members: dict_keys(['HubContentName', 'HubContentArn', 'SageMakerPublicHubContentArn', 'HubContentVersion', 'HubContentType', 'DocumentSchemaVersion', 'HubContentDisplayName', 'HubContentDescription',                                     
                             'SupportStatus', 'HubContentSearchKeywords', 'HubContentStatus', 'CreationTime', 'OriginalCreationTime']), Object Required Members: ['HubName', 'HubContentType', 'HubContentName']                                                                              
                    WARNING  Resource ImageVersion summaries do not have required members to create object instance. Resource may require custom key mapping for get_all().                                                                                          resources_codegen.py:1766
                             List ImageVersion Members: dict_keys(['CreationTime', 'FailureReason', 'ImageArn', 'ImageVersionArn', 'ImageVersionStatus', 'LastModifiedTime', 'Version']), Object Required Members: ['ImageName']      

Would need some change in how the ResourceIterator interacts with these custom_key_mapping to enable converting:

1. HubContentArn -> HubName
2. ImageVersionArn -> ImageName

To reproduce
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pip install .
python src/sagemaker_core/tools/codegen.py

Expected behavior
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Bug information
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• SageMaker Core version:
• Python version:
• Is the issue with autogen code or with generate code ?:

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[mollyheamazon]

fixed in #294