Sync eng/common directory with azure-sdk-tools for PR 7686 (#28581)

Sync eng/common directory with azure-sdk-tools for PR
https://github.com/Azure/azure-sdk-tools/pull/7686 See [eng/common
workflow](https://github.com/Azure/azure-sdk-tools/blob/main/eng/common/README.md#workflow)

Co-authored-by: Ben Broderick Phillips <bebroder@microsoft.com>

eng/common/scripts/job-matrix/job-matrix-functions.ps1

@@ -338,6 +338,9 @@ function ProcessReplace {
     $replaceMatrix = @()
 
     foreach ($element in $matrix) {
+        if (!$element -or $element.Count -eq 0) {
+            continue
+        }
         $replacement = [MatrixParameter[]]@()
         if (!$element -or $element.Count -eq 0) {
             continue