Revert "[netstack] Persist netstack inspect data"

This reverts commit 38e8140b578a078d025b48d51d6489317f20518d.

Reason for revert: need +2 from pr. folks

Original change's description:
> [netstack] Persist netstack inspect data
>
> Update netstack.persist to persist all netstack inspect data, modulo
> pprof. Persist this additional data and add test coverage.
>
> Tested: fx test netstack-sys-integration-test
> Tested: fx test netstack-gotests
> Fixed: 111272
> Change-Id: Id7336b8ef8e62825a9bde9e337b55769d1bcedd0
> Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/836296
> Reviewed-by: Miguel Flores <miguelfrde@google.com>
> Reviewed-by: Chris Phoenix <cphoenix@google.com>
> Reviewed-by: Nick Brown <nickbrow@google.com>
> Commit-Queue: Amanda Tait <atait@google.com>

Change-Id: If02ab342013a634a56c1b2812360889385518726
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/845776
Reviewed-by: Amanda Tait <atait@google.com>
Commit-Queue: Miguel Flores <miguelfrde@google.com>