[IMP] core: improve test logs

1. Make test logs clearer & remove redundancies

Instead of having an ERROR log right when the test fails then print
the useful / relevant information at the end of the test suite,
immediately print the traceback. Keep the final summary. Also avoids
having to wait for the entire test suite to end before a dev' can know
the failure details of a specific test.

Done by working at a lower level and replacing the custom
test stream mess by a custom Result class which prints and formats the
information we want. Replace TextTestRunner by a bare-bones custom
Runner object to tie it in.

2. Provide useful location information on test failure

Leverage the work above to log the test function's failure location:
previously logging would point to within TestStream which is not
useful.

Here, on failure the traceback is used to discover the caller info and
point to the test line which fails instead. similar to unittest's
_exc_info_to_string (https://github.com/python/cpython/blob/93e8aa62cfd0a61efed4a61a2ffc2283ae986ef2/Lib/unittest/result.py#L173).

3. Replace direct logging in browser_js by raising errors

Properly marks the test as in error, and the error traceback points to
the tour definition / launcher (python side) rather than common.py
and/or module.py.

Also removes unused dbname parameter that was added in
/278ed718e9805edf088642ba10d3b7c4e5716c31/openerp/modules/module.py#L361
for nor visible reason

closes odoo/odoo#34996

Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

odoo/modules/loading.py

@@ -251,7 +251,7 @@ def load_module_graph(cr, graph, status=None, perform_checks=True,
                 report.record_result(load_test(idref, mode))
                 # Python tests
                 env['ir.http']._clear_routing_map()     # force routing map to be rebuilt
-                report.record_result(odoo.modules.module.run_unit_tests(module_name, cr.dbname))
+                report.record_result(odoo.modules.module.run_unit_tests(module_name))
                 # tests may have reset the environment
                 env = api.Environment(cr, SUPERUSER_ID, {})
                 module = env['ir.module.module'].browse(module_id)