Removed get_api_exception and replaced with built in DRF exceptions

[AbhiYHub]

Fixes

Fixes #843 by @sarayourfriend

Description

In this PR I have done the following: -

1. Replaced all usages of get_api_exception function with the appropriate built-in DRF exception from rest_framework.exceptions.
2. Also, for any that are following the try: queryset.get(); except Model.DoesNotExist: ... pattern, replaced it with get_object_or_404.
3. Removed the get_api_exception function.
4. Code Cleanup.

Testing Instructions

• While testing I followed the developer doc and all the test cases passed successfully.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[sarayourfriend]

This is excellent, thank you @AbhiYHub. I have one small change I'd like to request but otherwise this looks great to me 🙂

[AbhiYHub]

@sarayourfriend I have raised a new PR by pulling the current changes from the main repo, please review it. I messed in reverting the changes, so I committed once more as last one got closed.

[sarayourfriend]

Sure thing, no worries! Rebasing/merging main in can get messy sometimes 😅

[AbhiYHub]

Sure thing, no worries! Rebasing/merging main in can get messy sometimes 😅

Thanks! @sarayourfriend