fix(slack-notifier): exclude health checks from alerts (#1335)

<!--- Provide a general summary of your changes in the Title above -->

## Description

<!--- Describe your changes in detail -->

Logging has changed a bit so need to change the endpoint to exclude from
alerts. We don't want to log the health-check endpoint traces, but that
has to be tweaked in another PR

## Related Issue(s)

- N/A

Slack discussion:
https://digdir.slack.com/archives/C079XRW5G5A/p1729643530959569

## Verification

- [ ] **Your** code builds clean without any errors or warnings
- [ ] Manual testing done (required)
- [ ] Relevant automated test added (if you find this hard, leave it and
we'll help out)

## Documentation

- [ ] Documentation is updated (either in `docs`-directory, Altinnpedia
or a separate linked PR in
[altinn-studio-docs.](https://github.com/Altinn/altinn-studio-docs), if
applicable)


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Enhanced alerting logic for the Slack Notifier function app to broaden
the scope of monitored requests.
- Defined SKU parameters to ensure valid options for resource
deployment.

- **Bug Fixes**
- Adjusted criteria for exception alerting to improve monitoring
accuracy.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: arealmaas

.azure/modules/functionApp/slackNotifier.bicep

@@ -162,7 +162,7 @@ var query = '''
                  | where type != "ZiggyCreatures.Caching.Fusion.SyntheticTimeoutException"),
                  (traces
                  | where severityLevel >= 3 or (severityLevel >= 2 and customDimensions.SourceContext startswith "Digdir"))
-                 | where operation_Name !startswith "GET /health/"
+                 | where customDimensions.RequestPath !startswith "/health"
              | summarize Count = count()
                  by
                  Environment = tostring(customDimensions.AspNetCoreEnvironment),