Bug 1839831 - Convert marionette test manifests to TOML. r=aleca

Differential Revision: https://phabricator.services.mozilla.com/D197551

--HG--
rename : mail/test/marionette/manifest.ini => mail/test/marionette/manifest.toml
rename : testing/marionette/unit-tests.ini => testing/marionette/unit-tests.toml
extra : moz-landing-system : lando

mail/test/marionette/manifest.ini

@@ -1 +0,0 @@
-[test_empty.py]

mail/test/marionette/manifest.toml

@@ -0,0 +1 @@
+["test_empty.py"]

mail/test/marionette/moz.build

@@ -3,4 +3,4 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-MARIONETTE_UNIT_MANIFESTS += ["manifest.ini"]
+MARIONETTE_UNIT_MANIFESTS += ["manifest.toml"]

testing/marionette/unit-tests.ini

@@ -1,2 +0,0 @@
-# mail tests
-[include:../../mail/test/marionette/manifest.ini]

testing/marionette/unit-tests.toml

@@ -0,0 +1,2 @@
+# mail tests
+["include:../../mail/test/marionette/manifest.ini"]