[BUG] Uniformize kernelspace name and display_name across notebooks

[baraline]

Introduced in #3222, modified a kernelspace name in notebook metadata, causing a crash in the CI for the code speed notebook.

Uniformized the kernelspace name and display name across all notebooks

[review-notebook-app]

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• Run pre-commit checks for all files
• Run mypy typecheck tests
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• Run numba-disabled codecov tests
• Disable numba cache loading
• Regenerate expected results for testing
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[TonyBagnall]

lgtm