Non-functional codebase improvements

[Omrigan]

Problem description / Motivation

There are small-scale non-functional changes/tech-debt we occasionally want to make here and there, but they do not have enough priority to deserve a separate issue. Feel free to add more.

Not sure it is the best way to track that, but I realized I keep a bunch of those in the head and needed to dump them somewhere.

Feature idea(s) / DoD

This issue doesn't have a DoD.

Ideas / Inbox

• Check if we can rely on panic less
• Outdated/unmaintained dependencies cleanup

Tasks

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1. Use ptr[T](obj T) *T everywhere
2. Rename VirtualMachine to VM in neonvm-controller
3. Replace ad-hoc workgroups with taskgroup from util: add taskgroup #922
4. Move sender threads to a taskgroup
5. lint for the very long lines (e. g. Implement scaling latency metrics through revisions #983 (comment))
6. Use consistent name when importing github.com/neondatabase/autoscaling/neonvm/apis/neonvm/v1