[IMP] core: reporting after tests

Currently there are a few issues with testing reporting (at the
command-line):

1. there is a global report after at_install tests, but it gets
   "scrolled off" by long post_install tests, and is thus easy to
   miss
2. with test tags, it's easy to fat finger a typo and run 0 tests,
   which look like everything's running fine (no failure)

To improve this, print a global report at shutdown (in
`--stop-after-init` mode if tests are enabled) which recapitulates the
test results *and prints a warning if no tests were run at all*.

Also update the reporting collection to make this more reliable:

* have `run_unit_tests` return `None` if it has run no tests, the
  assertion reporting machinery counts this as neither success nor
  failure which is exactly what we want
* have load_test only report a success *if files were actually
  loaded* (by having `load_data` return that information)

Task 2301268

closes odoo/odoo#54812

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

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