Enable Ruff Rule: Remove unneeded occurrences of the global keyword

[techy4shri]

Part of #10196

Refactor: Removed unneeded occurrences of the global keyword (13 instances) in 7 files to improve code clarity and maintainability.

Technical

This PR removes the unneeded use of the global keyword identified by PLW0602 warnings in 7 files (13 instances).
The code has been audited to ensure functionality remains unaffected. These variables have been restructured to use local or appropriately scoped replacements.
There were quite a few depreciation errors but I left them as they were since they are not part of the issue I worked on like python depreciated methods and npm depreceated libraries.

Testing

1. Ran ruff check . to confirm no linting errors or warnings, including PLW0602 issues.
2. Verified all unit tests passed using pytest, confirming no regressions were introduced.
3. Ran pre-commit run --all-files to verify things.

Screenshot

Stakeholders

@RayBB

[techy4shri]

Working on the errors.

[techy4shri]

@RayBB can you please check whether the db_parameters error is something to be solved on my end? The issue is that dbm.ndbm doesn't have open and error attributes and the parameters and I will have to edit reveal.py file for this. Not sure if I should do that.

[RayBB]

@techy4shri here's the approach I'd recommend:

1. Remove all the changes that aren't just removing the global keyword as recommended by ruff.
2. If you're getting errors related to one of the removals for now we can add a noqa comment after that line with a note that it's needed in this instance.

For this PR we don't want to make big changes. Just address the simple cases and add an exception via noqa comments for anything that would require more work.

[techy4shri]

I have only edited the files as required till now so changes needed there. It shows the same error, db_parameters are not specified in the configuration .
As for the noqa comment, I tried by adding it where the load_config() function is but it doesn't work I believe. Either I mock the config or add noqa comment in test file but then that would cause an error for others ig.

[RayBB]

I fixed the small issue with the data providers.
Great work on this one it is all looking good! :)

Now we just need staff to review and then merge.

[techy4shri]

Thanks a lot! Apologies for the trouble. I'll try not to repeat this mistake next time.