[management] Make startup period configurable

[pascal-fischer]

Describe your changes

Issue ticket number and link

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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

[Copilot]

Pull Request Overview

This PR makes the startup period of the peer update process configurable and updates the environment variable names accordingly.

• Renamed the environment variable from PEER_UPDATE_INTERVAL_MS to NB_PEER_UPDATE_INTERVAL_MS.
• Introduced a new configurable startup delay via NB_PEER_UPDATE_STARTUP_PERIOD_S instead of a fixed 30-second wait.

Comments suppressed due to low confidence (1)

management/server/account.go:213

• The computed variable 'initialInterval' is never used; consider using 'initialInterval' for storing the buffer interval or removing it if not needed, to avoid potential confusion about the intended interval value.

am.updateAccountPeersBufferInterval.Store(int64(time.Duration(interval) * time.Millisecond))

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[crn4]

LGTM