Some flakiness in channelhistory_time_f test

[funkyboy]

I set the test suite to temporary ignore it. See https://github.com/ably/ably-java/commit/cd89c8f405f27fb21f5669849200fd353d825a39

Failure happens usually on this line https://github.com/ably/ably-java/blob/66f639876fbbd43d020dd82e059fc7a33d22c4f3/lib/src/test/java/io/ably/lib/test/rest/RestChannelHistoryTest.java#L327 sometimes with text, sometimes with binary. Sometimes in java, and sometimes in android.

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