v1.18: Purges all bank snapshots after fastboot (backport of #35350)

[mergify]

This is an automatic backport of pull request #35350 done by Mergify.

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[brooksprumo]

Justification for backport:

Without this PR, a node can end up in a crash-boot loop that requires manual intervention. This is pretty bad, and potentially dangerous for the network as a whole. Also, in v1.18, fastboot is enabled by default, so this issue may get triggered more often than it is today on v1.17.

This PR safe, as the fix is to fall back to loading from a snapshot archive, which is safe (and very battle tested).

[jeffwashington]

lgtm. This is worth it to put it in 1.18. I am hitting this frequently with test nodes. It then often requires a manual snapshot load, which delays testing and requires manual intervention.

[apfitzge]

Straight-forward backport without conflict, the issue this PR addresses is being hit in 1.18 so deserves a backport imo.
I reviewed the initial master PR, so defering on explicit approval for someone from backport review squad

[steviez]

This PR safe, as the fix is to fall back to loading from a snapshot archive, which is safe (and very battle tested).

☝️

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.6%. Comparing base (06161dd) to head (06161dd).

❗ Current head 06161dd differs from pull request most recent head 15838d9. Consider uploading reports for the commit 15838d9 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##            v1.18   #35379   +/-   ##
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  Coverage    81.6%    81.6%           
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  Files         827      827           
  Lines      224237   224237           
=======================================
  Hits       183058   183058           
  Misses      41179    41179           

[willhickey]

Approved for beta

[brooksprumo]

@sakridge Can I get your review on this backport?