Laravel components v8 (#2576)

- update actions ci
- include json for 4 spaces tab
- provide output int for process code exit
- adhere to parent type hint of builder
- mailer instance now needs a name, multiple can be instantiated
- getOriginal now uses mutators in the model
- Temporarily loosen MailableInterface requirements. This avoids an immediate BC break for classes in extensions that implement this interface.
- Temporarily provide (and autoload) old symfony translator interface
- make queue exception handler compatible with the contract of L8
- Update phpunit schema for newer version
- Update phpunit assert calls for newer version

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        php: ['7.2', '7.3', '7.4', '8.0']
+        php: [7.3, 7.4, '8.0']
         service: ['mysql:5.7', mariadb]
         prefix: ['', flarum_]
 
@@ -21,12 +21,6 @@ jobs:
             prefixStr: (prefix)
 
         exclude:
-          - php: 7.2
-            service: 'mysql:5.7'
-            prefix: flarum_
-          - php: 7.2
-            service: mariadb
-            prefix: flarum_
           - php: 7.3
             service: 'mysql:5.7'
             prefix: flarum_
@@ -80,3 +74,5 @@ jobs:
 
       - name: Run Composer tests
         run: composer test
+        env:
+          COMPOSER_PROCESS_TIMEOUT: 600