MissingMandatoryParametersException when viewing upload extensions help page

Problem/Motivation

When viewing the help page for the "Allowed upload extensions" check at `/admin/reports/security-review/help/security_review/allowed_upload_extensions`, a white screen error occurs with the following exception:

Symfony\Component\Routing\Exception\MissingMandatoryParametersException:
Some mandatory parameters are missing ("storage_type") to generate a URL for route "entity.field_config.storage_field_edit_form".

This happens because the `UploadExtensions::getDetails()` method attempts to generate edit links for field configurations. When the link is rendered, some entity types (such as `group`, `paragraph`, etc.) require a `storage_type` route parameter that isn't being provided.

The code currently catches `RouteNotFoundException` but not `MissingMandatoryParametersException`, and the exception occurs during the rendering phase rather than the link creation phase.

Steps to reproduce

1. Install Security Review module on a site with custom entity types (e.g., Group module, Paragraphs)
2. Visit `/admin/reports/security-review/help/security_review/allowed_upload_extensions`
3. Observe white screen error with `MissingMandatoryParametersException`

Proposed resolution

Update the `UploadExtensions::getDetails()` method to:

1. Add `MissingMandatoryParametersException` to the catch block
2. Test URL generation **before** creating the Link object to ensure exceptions are caught during the try block
3. Fall back to plain text output when URL generation fails

This follows the same pattern used in #2988514: Field check gets fatal error when using Paragraphs (or other entity without edit or canonical routes).

Changes needed in `src/Plugin/SecurityCheck/UploadExtensions.php`:
- Add `use Symfony\Component\Routing\Exception\MissingMandatoryParametersException;`
- Update both try-catch blocks to test URL generation before creating links
- Catch both `RouteNotFoundException` and `MissingMandatoryParametersException`

Remaining tasks

- [ ] Fix the issue
- [ ] Attach a patch/MR
- [ ] Review the fix
- [ ] Commit the fix

User interface changes

None

API changes

None

Data model changes

None