Nested namespace resolve for thrust & libcudacxx

[viralbhadeshiya]

Description

• This changes will close Rewrite all C++ files to use nested namespace definitions #5022 completely.
• This PR have a changes that is needed for thrust and libcudacxx
• Previous work PR => Nested namespace fixes in General modules & cub #6425

closes #5022

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[viralbhadeshiya]

@bernhardmgruber this is final PR for nested_namespace fixes, This will finish all nested namespaces related changes.

[fbusato]

/ok to test fc24887

[fbusato]

look good. A leave the final word to Bernhard

[viralbhadeshiya]

Apologies, It's look like I made some mistake, I'll fix it tomorrow. you guys can put hold on this till then. Thanks for understanding.

[bernhardmgruber]

/ok to test cb28e3d

[github-actions]

🥳 CI Workflow Results

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[bernhardmgruber]

@viralbhadeshiya thank you for the contribution!