An unnamed break in a block now gives an UnnamedBreak warning (#20901)

* unnamed break in the block now gives an error

* bootstrap

* fixes

* more fixes

* break with label

* label again

* one moee

* Delete test5.txt

* it now gives a UnnamedBreak warning

* change the URL of bump back to the original one

tests/iter/titer_issues.nim

@@ -369,9 +369,9 @@ block:
 
 # bug #18824
 iterator poc_iterator: int {.closure.}  =
-  block:
+  block bug18824:
     try:
-      break
+      break bug18824
     finally:
       echo "In defer"