## Description
> Extend OAuth2AuthenticationException so that we can differentiate
between AppsmithException and exceptions thrown by Spring Library.
> There is not going to be any change to the Authentication flows here,
as the we are just inheriting the OAuth2AuthenticationException.
Fixes #`Issue Number`
_or_
Fixes `Issue URL`
> [!WARNING]
> _If no issue exists, please create an issue first, and check with the
maintainers if the issue is valid._
## Automation
/ok-to-test tags="@tag.All"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!TIP]
> 🟢🟢🟢 All cypress tests have passed! 🎉🎉🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/10092949232>
> Commit: bc2f204a6516fd527775daafb4829254d19251eb
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=10092949232&attempt=2"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.All`
> Spec:
> <hr>Thu, 25 Jul 2024 13:13:00 UTC
<!-- end of auto-generated comment: Cypress test results -->
## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Introduced a new custom exception for improved handling of OAuth 2.0
authentication errors, enhancing the clarity and robustness of the
authentication process.
- **Bug Fixes**
- Enhanced error categorization in the authentication process by
refining the error handling logic, allowing for better management of
exceptions related to OAuth 2.0.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Nilesh Sarupriya <20905988+nsarupr@users.noreply.github.com>
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