refactor: Change the logic for waiting about the isSignedIn() in Sender

[kujtimprenkuSQA]

Description

This PR changes logic and the waiting time for the isSignedIn() for Sender Wallet the details can be found here #944 (comment)

• This waiting time gets triggered only when some other extensions mentioned in the above comment block the Sender wallet from somehow updating the isSignedIn() state this means if these extensions are not installed or the user is not signed in the wallet selector there will be no waiting time.

Closes: #944

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Type of change.

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