chore: generalized query for slack notifier (#1125)

A more generalized query to filter out more noise from APIM (while we
try to fix the root cause)

.azure/modules/functionApp/slackNotifier.bicep

@@ -158,7 +158,7 @@ resource notifyDevTeam 'Microsoft.Insights/actionGroups@2023-01-01' = {
 var query = '''
             union
                  (exceptions
-                 | where problemId != "ClientConnectionFailure at forward-request" and problemId != "ClientConnectionFailure at transfer-response"),
+                 | where not(type == "ClientConnectionFailure" and customDimensions["Service ID"] == "altinn-dev-api")),
                  (traces
                  | where severityLevel >= 3 or (severityLevel >= 2 and customDimensions.SourceContext startswith "Digdir"))
              | summarize Count = count()