cli/interactive_tests: make test_client_side_checking easier to run l…

…ocally

Sometimes the shell invoked by `expect` adds additional escape
characters in-between the output of a process and the next prompt.
This patch makes the test more robust in that case.

Release note: None

pkg/cli/interactive_tests/test_client_side_checking.tcl

@@ -65,16 +65,18 @@ send "(echo '\\unset errexit'; echo 'begin;'; echo 'select 1+;'; echo 'select 1;
 eexpect "syntax error"
 eexpect "current transaction is aborted"
 eexpect ":/# "
-send "echo \$?\r"
-eexpect "1\r\n:/# "
+send "echo ::\$?::\r"
+eexpect "::1::"
+eexpect ":/# "
 
 send "(echo '\\unset errexit'; echo '\\set check_syntax'; echo 'begin;'; echo 'select 1+;'; echo 'select 1;'; echo 'commit;') | $argv sql\r"
 eexpect "syntax error"
 eexpect "1 row"
 eexpect "COMMIT"
 eexpect ":/# "
-send "echo \$?\r"
-eexpect "0\r\n:/# "
+send "echo ::\$?::\r"
+eexpect "::0::"
+eexpect ":/# "
 end_test
 
 start_test "Check that --debug-sql-cli sets suitable simplified client-side options."