LDAP setup improvements (#25421)

* first pass at LDAP setup improvements

* fix lint errors

* fix LDAP api tests

* WIP test for new setting setter

* fix setting test

* set ldap-enabled to true in ldap server macro

* try to fix java11 tests

* Update src/metabase/integrations/ldap.clj

Co-authored-by: metamben <103100869+metamben@users.noreply.github.com>

* add transaction

* remove ldap-ever-enabled? setting and revert some of the logic that is no longer necessary

* set ldap-enabled via the ldap api and add tests

* fix tests and lint

* fix error on settings save

* fix cypress test

* actually fix cypress

Co-authored-by: metamben <103100869+metamben@users.noreply.github.com>