Add check for etcd-snapshot-dir and fix panic in Walk

[brandond]

Proposed Changes

Add check for etcd-snapshot-dir and fix panic in Walk

Types of Changes

bugfix

Verification

See linked issue

Testing

Linked Issues

• Panic when etcd-snapshot-dir does not exist #9316

User-Facing Change

Further Comments

[codecov]

Codecov Report

Attention: 2544 lines in your changes are missing coverage. Please review.

Comparison is base (ce6158f) 49.07% compared to head (c4dd465) 40.51%.
Report is 184 commits behind head on master.

Files	Patch %	Lines
pkg/etcd/snapshot.go	34.93%	442 Missing and 74 partials ⚠️
pkg/etcd/s3.go	0.00%	233 Missing ⚠️
pkg/etcd/snapshot_controller.go	0.00%	216 Missing ⚠️
pkg/etcd/etcd.go	19.65%	168 Missing and 16 partials ⚠️
pkg/spegel/spegel.go	2.98%	130 Missing ⚠️
pkg/agent/containerd/containerd.go	0.00%	116 Missing ⚠️
pkg/spegel/bootstrap.go	1.81%	108 Missing ⚠️
pkg/apis/k3s.cattle.io/v1/zz_generated_deepcopy.go	17.35%	93 Missing and 7 partials ⚠️
pkg/server/secrets-encrypt.go	0.00%	84 Missing ⚠️
...d/controllers/k3s.cattle.io/v1/etcdsnapshotfile.go	0.00%	75 Missing ⚠️
... and 51 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9317      +/-   ##
==========================================
- Coverage   49.07%   40.51%   -8.56%     
==========================================
  Files         154      154              
  Lines       16416    16560     +144     
==========================================
- Hits         8056     6710    -1346     
- Misses       7090     8700    +1610     
+ Partials     1270     1150     -120     

Flag	Coverage Δ
e2etests	?
inttests	37.68% <25.62%> (-4.61%)	⬇️
unittests	14.52% <6.84%> (-0.07%)	⬇️

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