[IMP] testing: forbid module operations during testing

With this commit, module operations such as install, upgrades and
uninstalls are henceforth forbidden inside unit tests and instead such
tests must be performed with standalone Odoo scripts.

This is done because module operations during tests are not
transactional, this can leave the registry in an unclean state and
further tests may be affected by this, it also creates a new registry
which complicates registry cleanup if anything crashes,
because the registry to be cleaned up is not the same one that crashed.

Instead, what should be done is a script that imports odoo as a library,
and loads the database necessary then performs whichever operations
necessary. This script should contain a single function with a single
parameter (env) and should be decorated with
@odoo.tests.common.standalone in order to be executed properly, this
decorator accepts any amount of positional parameters as tags that can
be specified when calling the script in order to execute only a select
subset of scripts.

Special tags are: 'all' and <module_name>, these are generated
automatically, the first will execute ALL scripts available whereas
<module_name> will execute all scripts introduced by said module.

When calling the test_module_operations script, only scripts found in
*installed* modules will be executed, script discovery is only possible
if the code is loaded therefore it is only possible if the module is
installed.

closes odoo/odoo#49669

Signed-off-by: Adrian Torres (adt) <adt@odoo.com>

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