Feature/checkpoint deleting

[Jammy2211]

This PR removes legacy code that manually deletes checkpoint files for Nautilus and Dynesty searches and completely eliminates the nuclear mode functionality that is no longer used.

• Removed checkpoint file deletion if statements from Nautilus and Dynesty search modules
• Eliminated nuclear mode logic from abstract search, paths, and grid search modules

[Copilot]

Pull Request Overview

This PR removes legacy code that manually deletes checkpoint files for Nautilus and Dynesty searches and completely eliminates the nuclear mode functionality that is no longer used.

• Removed checkpoint file deletion if statements from Nautilus and Dynesty search modules
• Eliminated nuclear mode logic from abstract search, paths, and grid search modules

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
autofit/non_linear/search/nest/nautilus/search.py	Removed explicit checkpoint file removal
autofit/non_linear/search/nest/dynesty/search/abstract.py	Removed try block checking for checkpoint file removal
autofit/non_linear/search/abstract_search.py	Removed bypass_nuclear_if_on parameter and nuclear mode calls in post-fit handling
autofit/non_linear/paths/abstract.py	Removed nuclear mode deletion helper
autofit/non_linear/grid/grid_search/job.py	Adjusted job call to remove nuclear mode parameter
autofit/non_linear/grid/grid_search/init.py	Removed nuclear mode removal from metadata saving

[Jammy2211]

The final push puts the if statements deleting checkpoint files back in, but now does so in the output_search_internal function.

I remembered that these if loops were used to delete checkpoint files that were a duplicate of the search_internal.dill file that normalizes the search. Putting them where they now are fixes the bug but retains the expected behaviour.