MDL-50666 behat: Make feature names unique

* We need to have unique feature names for our Behat tests.
* I also removed the custom Behat tag @role_visibility as we only allow
Behat tags with the component name in Frankenstyle format.

badges/tests/behat/role_visibility.feature

@@ -1,5 +1,5 @@
-@core @core_badges @role_visibility
-Feature: Test role visibility
+@core @core_badges
+Feature: Test role visibility for the badge administration page
   In order to control access
   As an admin
   I need to control which roles can see each other
@@ -48,4 +48,4 @@ Feature: Test role visibility
     And I set the following fields to these values:
       | Add badge criteria | Manual issue by role |
     Then I should see "Teacher"
-    And I should not see "Manager"
+    And I should not see "Manager"

enrol/tests/behat/role_visibility.feature

@@ -1,5 +1,5 @@
-@core @core_enrol @role_visibility
-Feature: Test role visibility
+@core @core_enrol
+Feature: Test role visibility for the participants page
   In order to control access
   As an admin
   I need to control which roles can see each other
@@ -35,4 +35,4 @@ Feature: Test role visibility
     Then "Learner 1" row "Roles" column of "participants" table should contain "Student"
     And "Teacher 1" row "Roles" column of "participants" table should contain "Teacher"
     And "Manager 1" row "Roles" column of "participants" table should not contain "Manager"
-    And "Manager 1" row "Roles" column of "participants" table should contain "No roles"
+    And "Manager 1" row "Roles" column of "participants" table should contain "No roles"

group/tests/behat/role_visibility.feature

@@ -1,5 +1,5 @@
-@core @core_group @role_visibility
-Feature: Test role visibility
+@core @core_group
+Feature: Test role visibility for the groups management page
   In order to control access
   As an admin
   I need to control which roles can see each other