[FIX] mail: various discuss test fixes

This commit fixes two issues with discuss tests (JS):

    1. Improved mocked `message_fetch` rpc

        Some tests were incorrectly mocking the `message_fetch` rpc.

        With this commit, the mock server correctly mock this route,
        so that tests should simply pass the records as data, and the
        mock server correctly handles this rpc.

    2. Patch `_.debounce` and `_.throttle`

        The test "older messages are loaded on scroll" failed with
        Google Chrome right after destroying the widget discuss.
        This is due to a debounced function that called its inner
        function at this moment.

        With this commit, any discuss test patch `_.debounce` and
        `_.throttle` so that the inner functions are executed
        immediately and synchronously.

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