[yamato] Set triggers for any PR against a target branch. (#2848)

.yamato/csharp-tests.yml

   commands:
     - ./run-tests-editmode-osx-editor.sh
   triggers:
-    branches:
-      only:
-        - "/develop-.*/"
-    targets:
-      only:
-        - "develop"
+            - "develop"
             - "master"
             - "/release-.*/"
             - "/hotfix-.*/"

.yamato/standalone-build-test.yml

   commands:
     - ./run-standalone-build-osx.sh
   triggers:
-    branches:
-      only:
-        - "/develop-.*/"
-    targets:
-      only:
-        - "develop"
+            - "develop"
             - "master"
             - "/release-.*/"
             - "/hotfix-.*/"