This will vastly improve troubleshooting when an unexpected error
occurs.
# What this PR does
Enables logging of the exception that might be thrown by
SocialAuthExceptionMiddleware. It vastly improves the speed and accuracy
of troubleshooting requests to external applications with the aim to
authenticate, since there is usually no response to look at.
## Which issue(s) this PR fixes
Closes [#2035](https://github.com/grafana/oncall/issues/2035)
## Checklist
- [ ] Unit, integration, and e2e (if applicable) tests updated
- [ ] Documentation added (or `pr:no public docs` PR label added if not
required)
- [ ] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)
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Co-authored-by: Innokentii Konstantinov <innokenty.konstantinov@grafana.com>
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