vim-patch:8.2.5102: interrupt not caught in test

Problem:    Interrupt not caught in test.
Solution:   Consider an exception thrown in the current try/catch when got_int
            is set.  Also catch early exit when not using try/catch.

8bea171f15

Cherry-pick test changes from patch 8.2.0557.

bfe13ccc58

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/testing.c

@@ -606,6 +606,7 @@ theend:
   suppress_errthrow = false;
   in_assert_fails = false;
   did_emsg = false;
+  got_int = false;
   msg_col = 0;
   no_wait_return--;
   need_wait_return = false;