Fix React Hooks send double ATTACH message action and get doubled rewind messages when using options on v2

[VeskeR]

When using ChannelProvider with any sort of options:

<ChannelProvider channelName="my-channel-rewind" options={options}>
  <Component></Component>
</ChannelProvider>

It causes channel to send double ATTACH messages:

If using any rewind options { params: { rewind: '1' } }, this then leads to us getting last N rewind messages twice, so we end up with duplicates.
Issue appeared on v2 after transitioning to ChannelProvider implementation in #1620, merge commit ec95b59

This is caused when ChannelProvider calls .setOptions() on the channel in its useEffect hook

ably-js/src/platform/react-hooks/src/ChannelProvider.tsx

Line 48 in af0f3f1

channel.setOptions(channelOptionsWithAgent(options));

when channel already started attachment process just before that from within useChannel hook (for example, providing a listener to useChannel hook causes it to attach). Calling .setOptions() in this case triggers reattachment and for some reason causes double ATTACH message being sent, both with the same rewind options (even though first attachment should've been done without any options - they were not set yet).
This is probably an underlying issue with ably-js itself, it should not send double ATTACH messages like in this case. Probably the expected behaviour would be to send first ATTACH message without any options (triggered from useChannel hook when no options are set), and then a second ATTACH message with options from .setOptions() call.

┆Issue is synchronized with this Jira Bug by Unito