Bug 1893223 - [marionette] Fix master manifest for in-tree Marionette tests....

* {class}`Marionette <marionette_driver.marionette.Marionette>`: client that speaks to Firefox

[here]: /python/marionette_driver.rst

## Registering Test Manifests

To run Marionette Python tests locally via `mach` or as part of the `Mn` tests jobs

in CI they need to be registered. This happens by adding a manifest file to the tree,

which includes a reference to the test files and expectations for results.

Such a manifest file can look like the following and is stored with the extension `.toml`:

```ini

[DEFAULT]

["test_expected_fail.py"]

expected = "fail"

["test_not_on_windows.py"]

skip-if = ["os == 'win'"]

```

The registration of such a manifest file is done in two different ways:

1. To run the tests locally via `./mach test` or `./mach marionette-test` the

created Marionette manifest file needs to be referenced in the folder's related

`moz.build` file by adding it to the `MARIONETTE_MANIFESTS` variable like:

    MARIONETTE_MANIFESTS += ["test/marionette/manifest.toml"]

2. To run the tests in CI the manifest file also needs to be included in the

Marionette's own [master manifest file]. This ensures that the test packaging step

will find the tests and include them as well in the test package.

[master manifest file]: https://searchfox.org/mozilla-central/source/testing/marionette/harness/marionette_harness/tests/unit-tests.toml

# marionette unit tests

["include:unit/unit-tests.toml"]

# DOM tests

["include:../../../../../dom/cache/test/marionette/manifest.toml"]

["include:../../../../../dom/indexedDB/test/marionette/manifest.toml"]

["include:../../../../../dom/quota/test/marionette/manifest.toml"]

["include:../../../../../dom/workers/test/marionette/manifest.toml"]

# browser tests

["include:../../../../../browser/components/backup/tests/marionette/manifest.toml"]

["include:../../../../../browser/components/migration/tests/marionette/manifest.toml"]

["include:../../../../../browser/components/sessionstore/test/marionette/manifest.toml"]

["include:../../../../../browser/components/tests/marionette/manifest.toml"]

# DOM tests

["include:../../../../../dom/cache/test/marionette/manifest.toml"]

["include:../../../../../dom/indexedDB/test/marionette/manifest.toml"]

["include:../../../../../dom/quota/test/marionette/manifest.toml"]

["include:../../../../../dom/workers/test/marionette/manifest.toml"]

# extensions tests

["include:../../../../../extensions/pref/autoconfig/test/marionette/manifest.toml"]

# js tests

["include:../../../../../js/xpconnect/tests/marionette/manifest.toml"]

# layout tests

["include:../../../../../layout/base/tests/marionette/manifest.toml"]

["include:../../../../../toolkit/components/antitracking/bouncetrackingprotection/test/marionette/manifest.toml"]

["include:../../../../../toolkit/components/cleardata/tests/marionette/manifest.toml"]

["include:../../../../../toolkit/components/extensions/test/marionette/manifest-serviceworker.toml"]

["include:../../../../../toolkit/xre/test/marionette/marionette.toml"]

["include:../../../../../toolkit/xre/test/marionette/manifest.toml"]

# update tests

["include:../../../../../toolkit/mozapps/update/tests/marionette/marionette.toml"]

# update tests (move into toolkit above once bug 1898477 is fixed)

["include:../../../../../toolkit/mozapps/update/tests/marionette/manifest.toml"]

]

TEST_DIRS += ["tests"]

MARIONETTE_MANIFESTS += ["tests/marionette/marionette.toml"]

EXTRA_COMPONENTS += [

    "nsUpdateService.manifest",

    if CONFIG["MOZ_BITS_DOWNLOAD"]:

        BROWSER_CHROME_MANIFESTS += ["browser/browser.bits.toml"]

MARIONETTE_MANIFESTS += ["marionette/manifest.toml"]

XPCSHELL_TESTS_MANIFESTS += [

    "unit_aus_update/xpcshell.toml",

    "unit_base_updater/xpcshell.toml",