fix: Added missing unsubscribe returns for sub functions in AppKit Core

[glitch-txs]

Description

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Type of change

• Chore (non-breaking change that addresses non-functional tasks, maintenance, or code quality improvements)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
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Associated Issues

For Linear issues: Closes APKT-xxx
For GH issues: closes #5377

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[Copilot]

Pull request overview

This PR fixes a bug where two subscription methods (subscribeShouldUpdateToAddress and subscribeCaipNetworkChange) were missing return statements for their unsubscribe functions, and refactors subscribeAccount to properly aggregate and return all unsubscribe functions from its multiple controller subscriptions.

• Added return statements to subscribeShouldUpdateToAddress and subscribeCaipNetworkChange methods
• Refactored subscribeAccount to collect and return all unsubscribe functions via a cleanup function
• Added comprehensive tests to verify all subscribe methods return unsubscribe functions

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/appkit/src/client/appkit-base-client.ts	Added missing return statements for two subscribe methods and refactored subscribeAccount to properly aggregate unsubscribe functions
packages/appkit/tests/client/appkit-core.test.ts	Added comprehensive tests to verify all subscribe methods return unsubscribe functions and that cleanup works correctly

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