Possible Range plan is not used with nested outer joins.

MDEV-21383 fixed the issue with possible range plans not being used for inner joins.

Now, I am observing a similar issue for nested outer joins.

(I can't attach a testcase, because I don't have it atm. I have customer table DDLs and optimizer_trace. I've made a patch which fakes the optimizer stats and records_in_range() return values, and then I can see a bad query plan to be generated).

Checking my testcase against other server versions:

• The issue is not reproducible before the patch for MDEV-21383.
• The issue is not reproducible with the original, "conservative" patch for MDEV-21383: https://github.com/MariaDB/server/commit/a49376056f9eeeb76f1818c0d8b9f9e006d4dfe3