multi: manage shutdown requests with status codes

[mohamedawnallah]

Change Description

In this commit, we handle shutdown requests with status codes:

• Code 1: Critical errors (e.g., failed chain backend connection).
• Code 0: Normal shutdowns (e.g., Stop Daemon RPC).

Replaces #8659
Closes #5625

Additional Context

Shutdown Scenario	Status Code	Description
Critical Error (e.g., exhausted attempts connecting to chain backend)	1	Indicates a failure that requires immediate attention and prevents normal operation of the daemon.
Normal Shutdown (e.g., Stop Daemon RPC call)	0	Represents a graceful termination initiated by the user or a normal process shutdown.

Credits

• @ellemouton: Provided a simpler design for the issue.
• @Chinwendu20: Highlighted that the initial draft of PR signal: manage shutdown requests with status codes #8659 was over-engineered.

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