(meta) Missing API endpoints

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We don't always create APIs for features we provide in the UI. Companies are asking for them so they can integrate those calls into their stacks.

Here are the missing ones:

• Push rule https://gitlab.com/gitlab-org/gitlab-ee/issues/948, https://gitlab.com/gitlab-org/gitlab-ee/issues/493: !1022 (merged)
• Issue weight https://gitlab.com/gitlab-org/gitlab-ee/issues/749: !1023 (merged)
• Protected branches https://gitlab.com/gitlab-org/gitlab-ee/issues/1075

cc @DouweM