[FIX] tests: clean up environments in `SavepointCase`

The following issue occurs nondeterministically: a test fails when
trying to flush pending updates with a user id that does not exist.
This only happens with `SavepointCase` tests.

Here is the explanation: the method `cr.savepoint()` retrieves an
environment to flush pending updates, and the chosen environment has a
user that was created in another test, and thus no longer exists.  The
problem is that `Environments.envs` contains environments that are no
longer supposed to be used.

The solution consists in, after the test, discarding the environments
that were not present before the test.

closes odoo/odoo#37341

Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

0 files changed, 0 insertions, 0 deletions