Minor fixups in log handling

src/Aspire.Dashboard/ConsoleLogs/TimestampParser.cs

@@ -74,5 +74,5 @@ private static string ConvertTimestampFromUtc(ReadOnlySpan<char> timestamp)
     [GeneratedRegex("^(?:\\d{4})-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12][0-9]|3[01])T(?:[01][0-9]|2[0-3]):(?:[0-5][0-9]):(?:[0-5][0-9])(?:\\.\\d{1,9})?(?:Z|(?:[Z+-](?:[01][0-9]|2[0-3]):(?:[0-5][0-9])))?")]
     private static partial Regex GenerateRfc3339RegEx();
 
-    public readonly record struct TimestampParserResult(string? ModifiedText, string? Timestamp);
+    public readonly record struct TimestampParserResult(string ModifiedText, string Timestamp);
 }

src/Aspire.Dashboard/Otlp/Model/OtlpLogEntry.cs

@@ -36,7 +36,7 @@ public OtlpLogEntry(LogRecord record, OtlpApplication logApp, OtlpScope scope)
                     // Explicitly ignore these
                     break;
                 default:
-                    properties.Add(new KeyValuePair<string, string>(kv.Key, kv.Value.GetString()));
+                    properties.Add(KeyValuePair.Create(kv.Key, kv.Value.GetString()));
                     break;
             }
         }

src/Aspire.Hosting/Dashboard/DockerContainerLogSource.cs

@@ -34,7 +34,7 @@ public async IAsyncEnumerable<string[]> WatchOutputLogAsync([EnumeratorCancellat
     {
         if (_containerLogWatcher is not null)
         {
-            await foreach (var logs in _containerLogWatcher!.WatchOutputLogsAsync(cancellationToken).ConfigureAwait(false))
+            await foreach (var logs in _containerLogWatcher.WatchOutputLogsAsync(cancellationToken).ConfigureAwait(false))
             {
                 yield return logs;
             }
@@ -45,7 +45,7 @@ public async IAsyncEnumerable<string[]> WatchErrorLogAsync([EnumeratorCancellati
     {
         if (_containerLogWatcher is not null)
         {
-            await foreach (var logs in _containerLogWatcher!.WatchErrorLogsAsync(cancellationToken).ConfigureAwait(false))
+            await foreach (var logs in _containerLogWatcher.WatchErrorLogsAsync(cancellationToken).ConfigureAwait(false))
             {
                 yield return logs;
             }

src/Aspire.Hosting/Dashboard/FileLogSource.cs

@@ -62,10 +62,10 @@ private static async IAsyncEnumerable<string[]> WatchLogAsync(string filePath, [
         while (!cancellationToken.IsCancellationRequested)
         {
             var reader = PipeReader.Create(fileStream, s_streamPipeReaderOptions);
-            
+
             while (!cancellationToken.IsCancellationRequested)
             {
-                var result = await reader!.ReadAsync(cancellationToken).ConfigureAwait(false);
+                var result = await reader.ReadAsync(cancellationToken).ConfigureAwait(false);
 
                 if (result.IsCompleted)
                 {