Refactor pagination to call Get-MessageTraceV2 directly instead of Invoke-Command

- Use StartingRecipientAddress and EndDate from last result for pagination
- Remove warning message parsing and dynamic scriptblock execution
- Move timeout check inside loop to only warn when data is actually truncated

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Nickul-MSFT

Transport/Get-AllMessageTraceResults.ps1

@@ -68,31 +68,29 @@ function Get-AllMessageTraceResults {
 
     $splatParams["ResultSize"] = $PageSize
 
-    $moreResultsPrefix = "There are more results, use the following command to get more. "
-
     Write-Progress -Activity "Fetching message trace data" -Status "Page $page..."
-    $results = Get-MessageTraceV2 @splatParams -WarningVariable moreAvailable 3>$null
+    $results = Get-MessageTraceV2 @splatParams 3>$null
     if ($results) { $allResults.AddRange(@($results)) }
 
-    $nextCommand = "Get-MessageTraceV2 @splatParams"
-    $moreResultsMessage = if ($moreAvailable.Count -gt 0) { $moreAvailable[-1].ToString() } else { "" }
-    while ($results.Count -eq $PageSize -and $moreResultsMessage.StartsWith($moreResultsPrefix) -and (Get-Date) -lt $timeout) {
+    $timedOut = $false
+    while ($results.Count -eq $PageSize) {
+        if ((Get-Date) -ge $timeout) {
+            $timedOut = $true
+            break
+        }
         $page++
+        $lastResult = $results[-1]
+        $splatParams["StartingRecipientAddress"] = $lastResult.RecipientAddress
+        $splatParams["EndDate"] = $lastResult.Received
         Write-Progress -Activity "Fetching message trace data" -Status "Retrieved $($allResults.Count) messages (page $page)..."
-        $nextCommand = $moreResultsMessage.Substring($moreResultsPrefix.Length)
-        $results = Invoke-Command -ScriptBlock ([ScriptBlock]::Create($nextCommand)) -WarningVariable moreAvailable 3>$null
+        $results = Get-MessageTraceV2 @splatParams 3>$null
         if ($results) { $allResults.AddRange(@($results)) }
-        $moreResultsMessage = if ($moreAvailable.Count -gt 0) { $moreAvailable[-1].ToString() } else { "" }
-    }
-
-    if ($results.Count -eq $PageSize -and -not $moreResultsMessage.StartsWith($moreResultsPrefix)) {
-        Write-Warning "Get-MessageTraceV2 pagination failed with unexpected warning message: '$moreResultsMessage'. Last command: '$nextCommand'"
     }
 
     Write-Progress -Activity "Fetching message trace data" -Completed
 
-    if ((Get-Date) -ge $timeout) {
-        Write-Warning "Timed out after $TimeoutMinutes minutes. Returning $($allResults.Count) results collected so far."
+    if ($timedOut) {
+        Write-Warning "Timed out after $TimeoutMinutes minutes with more results available. Returning $($allResults.Count) results collected so far."
     }
 
     Write-Verbose "Total messages retrieved: $($allResults.Count)"