Cherry-Pick bug fixes for final 1.6 release (#2862)

## Why make this change?

- The 1.6 release has a bug related to the new Azure Log Analytics
feature.

## What is this change?

Cherry-picked PR:
- Bug Fix:
  - #2854

## How was this tested?

- [ ] Integration Tests
- [X] Unit Tests

Author: RubenCerna2079

src/Service.Tests/Configuration/Telemetry/AzureLogAnalyticsTests.cs

@@ -120,7 +120,7 @@ public async Task TestAzureLogAnalyticsFlushServiceSucceed(string message, LogLe
 
         _ = Task.Run(() => flusherService.StartAsync(tokenSource.Token));
 
-        await Task.Delay(1000);
+        await Task.Delay(2000);
 
         // Assert
         AzureLogAnalyticsLogs actualLog = customClient.LogAnalyticsLogs[0];

src/Service/Telemetry/AzureLogAnalyticsCustomLogCollector.cs

@@ -53,14 +53,18 @@ await _logs.Writer.WriteAsync(
     public async Task<List<AzureLogAnalyticsLogs>> DequeueAllAsync(string dabIdentifier, int flushIntervalSeconds)
     {
         List<AzureLogAnalyticsLogs> list = new();
-        Stopwatch time = Stopwatch.StartNew();
 
         if (await _logs.Reader.WaitToReadAsync())
         {
-            while (_logs.Reader.TryRead(out AzureLogAnalyticsLogs? item))
+            Stopwatch time = Stopwatch.StartNew();
+
+            while (true)
             {
-                item.Identifier = dabIdentifier;
-                list.Add(item);
+                if (_logs.Reader.TryRead(out AzureLogAnalyticsLogs? item))
+                {
+                    item.Identifier = dabIdentifier;
+                    list.Add(item);
+                }
 
                 if (time.Elapsed >= TimeSpan.FromSeconds(flushIntervalSeconds))
                 {