[Management] replace update channel with buffer

[pascal-fischer]

Describe your changes

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Checklist

• Is it a bug fix
• Is a typo/documentation fix
• Is a feature enhancement
• It is a refactor
• Created tests that fail without the change (if possible)
• Extended the README / documentation, if necessary

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[Copilot]

Pull Request Overview

This PR refactors the update channel mechanism by replacing it with a custom update buffer, and it also adds additional network serial number increments in various parts of the codebase. Key changes include:

• Replacing the channel-based update mechanism with an UpdateBuffer.
• Reducing the buffer size constant in updatechannel.go.
• Adding calls to IncrementNetworkSerial in several functions to ensure peers receive updated network information.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
management/server/user.go	Added IncrementNetworkSerial call to update network changes.
management/server/updatechannel.go	Replaced chan-based channels with UpdateBuffer usage.
management/server/update_buffer.go	Introduced UpdateBuffer for buffering updates.
management/server/peer.go	Added IncrementNetworkSerial calls during peer events.
management/server/grpcserver.go	Updated Sync and handleUpdates to work with the UpdateBuffer.
management/server/account.go	Added IncrementNetworkSerial call in onPeersInvalidated hook.

[sonarqubecloud]

Quality Gate failed

Failed conditions
1 New issue
1 New Code Smells (required ≤ 0)

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