[chat-spec] Removed transient timeout references for delayed ATTACHING state

[sacOO7]

• Use of the term transient disconnect timeout in the context of transitioning state to ATTACHING is wrong.
• At the same time, related implementation conflicts with CHA-RL9
• Fixed [chat-spec][Room monitoring] Remove or simplify transient detach timeout for room monitoring #262

[sacOO7]

Link to active discussion -> https://ably-real-time.slack.com/archives/C03JDBVM5MY/p1736416097802209

[sacOO7]

@AndyTWF Btw, we should be creating new spec points instead of updating existing ones right?
Currently, I updated existing spec points for better understanding.

[AndyTWF]

@AndyTWF Btw, we should be creating new spec points instead of updating existing ones right? Currently, I updated existing spec points for better understanding.

That's usually what we do, yes - though I'd say if Kotlin/Swift aren't implementing them yet, its probably ok to just update the existing.

[lawrence-forooghian]

I think we're at the point now where if we're going to change lifecycle spec points then we should follow the proper guidance for modification; I'm pretty sure that the spec points that you've changed here are already implemented in Swift so we shouldn't mutate them.

[sacOO7]

@lawrence-forooghian updated PR as per your suggestion 👍