[EDU-2104] Update endpoints from ably.io to ably.net

[m-hulbert]

Description

This PR updates the listed endpoints from ably.io to the new formats;

• realtime.ably.io and rest.ably.io consolidated to main.realtime.ably.net
• mqtt.ably.io to main.mqtt.ably.net
• pusher.ably.io and realtime-pusher.ably.io to main.pusher.ably.net
• pubnub.ably.io to main.pubnub.ably.net

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch edu-2104-update-endpoints

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[SimonWoolf]

no objection from me but not approving as I'll leave it to Laura to confirm the endpoints are right from an infra pov

[surminus]

Sandbox uses a nonprod domain:

Suggested change

	curl -X POST "https://sandbox-main.realtime.ably.net/channels/my-channel/objects" \
	curl -X POST "https://sandbox.realtime.ably-nonprod.net/channels/my-channel/objects" \

[m-hulbert]

Ah good spot! I think this should actually have been pointing to main originally. eccdd53

[surminus]

Just one correction related to sandbox but otherwise looks good