Skip some errors from being sent to telemetry (#8003)

## Summary of changes

Skips a few errors that are `Ignored` in Error Tracking and shouldn't
really be sent to telemetry as we can't act on them.

## Reason for change

Nothing we can really do about these.

## Implementation details

Marked as `ErrorSkipTelemetry`

## Test coverage

N/A

## Other details
<!-- Fixes #{issue} -->

I guess one thing we do lose here is whether we _want_ to see how often
these happen?


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Author: bouwkast

tracer/src/Datadog.Trace/AgentProcessManager.cs

@@ -70,7 +70,7 @@ public static void Initialize()
                 var azureAppServiceSettings = new ImmutableAzureAppServiceSettings(GlobalConfigurationSource.Instance, NullConfigurationTelemetry.Instance);
                 if (azureAppServiceSettings.IsUnsafeToTrace)
                 {
-                    Log.Error("The Azure Site Extension doesn't have the required parameters to work. The API_KEY is likely missing. The trace_agent and dogstatsd process will not be started. Check your app configuration and restart the app service to try again.");
+                    Log.ErrorSkipTelemetry("The Azure Site Extension doesn't have the required parameters to work. The API_KEY is likely missing. The trace_agent and dogstatsd process will not be started. Check your app configuration and restart the app service to try again.");
                     return;
                 }
 

tracer/src/Datadog.Trace/Ci/Coverage/Util/CoverageUtils.cs

@@ -73,7 +73,7 @@ private static bool TryCombineAndGetTotalCoverage(string? inputFolder, out Globa
             var jsonFiles = Directory.GetFiles(inputFolder, "*.json", SearchOption.TopDirectoryOnly);
             if (jsonFiles.Length == 0)
             {
-                Log.Error("'{InputFolder}' doesn't contain any json file.", inputFolder);
+                Log.ErrorSkipTelemetry("'{InputFolder}' doesn't contain any json file.", inputFolder);
                 return false;
             }
 

tracer/src/Datadog.Trace/Configuration/ImmutableAzureAppServiceSettings.cs

@@ -56,7 +56,7 @@ public ImmutableAzureAppServiceSettings(IConfigurationSource? source, IConfigura
 
             if (string.IsNullOrEmpty(apiKey))
             {
-                Log.Error("The Azure Site Extension will not work if you have not configured DD_API_KEY.");
+                Log.ErrorSkipTelemetry("The Azure Site Extension will not work if you have not configured DD_API_KEY.");
                 IsUnsafeToTrace = true;
             }