T1153-T1531_CleanupErrors (#846)

Co-authored-by: Carrie Roberts <clr2of8@gmail.com>

atomics/T1158/T1158.yaml

@@ -147,4 +147,4 @@ atomic_tests:
       set-content -path . -stream #{ads_filename} -value "test3"
       ls -Recurse | %{ gi $_.Fullname -stream *} | where stream -ne ':$Data' | Select-Object pschildname
     cleanup_command: |
-      Remove-Item -Path #{file_name}
+      Remove-Item -Path #{file_name} -ErrorAction Ignore

atomics/T1170/T1170.yaml

@@ -70,5 +70,4 @@ atomic_tests:
       $var.content|out-file "#{temp_file}"
       mshta "#{temp_file}"
     cleanup_command: |  
-      remove-item "#{temp_file}" 
-
+      remove-item "#{temp_file}" -ErrorAction Ignore

atomics/T1502/T1502.yaml

@@ -41,5 +41,6 @@ atomic_tests:
       $ppid=Get-Process #{parent_process_name} | select -expand id
       PPID-Spoof -ppid $ppid -spawnto "#{spawnto_process_path}" -dllpath "#{dll_path}"
     cleanup_command: |
-      Stop-Process -Name "#{dll_process_name}"
-      Stop-Process -Name "#{spawnto_process_name}"
+      Stop-Process -Name "#{dll_process_name}" -ErrorAction Ignore
+      Stop-Process -Name "#{spawnto_process_name}" -ErrorAction Ignore
+