patch 8.2.2506: Vim9: :continue does not work correctly in a :try block

Problem:    Vim9: :continue does not work correctly in a :try block
Solution:   Add the TRYCLEANUP instruction. (closes #7827)

src/testdir/test_vim9_script.vim

@@ -2201,6 +2201,23 @@ def Test_for_loop_unpack()
   CheckDefExecFailure(lines, 'E1017:', 1)
 enddef
 
+def Test_for_loop_with_try_continue()
+  var looped = 0
+  var cleanup = 0
+  for i in range(3)
+    looped += 1
+    try
+      eval [][0]
+    catch
+      continue
+    finally
+      cleanup += 1
+    endtry
+  endfor
+  assert_equal(3, looped)
+  assert_equal(3, cleanup)
+enddef
+
 def Test_while_loop()
   var result = ''
   var cnt = 0