refactor(nms): Use networkIds from AppContext consistently

[thmsschmitt]

Summary

Use networks ids from AppContext instead of duplicating the state three times.

Test Plan

• Open the manage networks view.
• Add a network
• Make sure the network is shown in the manage network table and in the dropdown in the top bar
• Remove a network
• Make sure the network is no longer shown in the manage network table and in the dropdown
• Add a network through the "Create Network" entry in the dropdown
• Make sure the network is shown in both places

[github-actions]

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[github-actions]

dp-workflow

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Results for commit b51ee9d.