MDEV-16944 Fix file sharing issues on Windows in mysqltest

On Windows systems, occurrences of ERROR_SHARING_VIOLATION due to
conflicting share modes between processes accessing the same file can
result in CreateFile failures.

mysys' my_open() already incorporates a workaround by implementing
wait/retry logic on Windows.

But this does not help if files are opened using shell redirection like
mysqltest traditionally did it, i.e via

--echo exec "some text" > output_file

In such cases, it is cmd.exe, that opens the output_file, and it
won't do any sharing-violation retries.

This commit addresses the issue by introducing a new built-in command,
'write_line', in mysqltest. This new command serves as a brief alternative
to 'write_file', with a single line output, that also resolves variables
like "exec" would.

Internally, this command will use my_open(), and therefore retry-on-error
logic.

Hopefully this will eliminate the very sporadic "can't open file because
it is used by another process" error on CI.

mysql-test/suite/innodb_gis/t/rollback.test

@@ -463,7 +463,7 @@ rollback;
 
 # Test partial update rollback after recovered.
 # Crash the server in partial update.
---exec echo "restart" > $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
+--write_line restart $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
 set session debug="+d,row_mysql_crash_if_error";
 --error 2013
 update t1 set a=point(5,5), b=point(5,5), c=5 where i < 3;