chore: Remove propagate_const

[bnbajwa]

std::experimental::propagate_const is better choice as it's documented and tested.

SDB-9943

[gemini-code-assist]

Summary of Changes

Hello @bnbajwa, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the codebase by removing a custom implementation of propagate_const. The change is driven by the decision to adopt std::experimental::propagate_const, leveraging a standardized and well-vetted solution. This improves maintainability and reduces the burden of custom code, aligning with best practices for using established library features.

Highlights

• Removal of Custom Implementation: The custom propagate_const class and its associated helper structures (pointed_underlying) have been entirely removed from the toolbox/util/PropagateConst.hpp file.
• Adoption of Standard Library Feature: The project will now utilize std::experimental::propagate_const, which is a documented and tested alternative, replacing the previously custom-built solution.

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[gemini-code-assist]

Code Review

The pull request removes the PropagateConst.hpp file, as it's being replaced by std::experimental::propagate_const. I have added a review comment to reflect the removal of the file.