Fix issue with snapshot metadata configmap

[brandond]

Proposed Changes

Omit snapshot list configmap entries for snapshots without extra metadata; reduce log level of warnings about missing s3 metadata files.

Types of Changes

bugfix

Verification

See linked issue

Testing

Linked Issues

• k3s-etcd-snapshot configmap should not contain entries without extra metadata #8834

User-Facing Change

Omit snapshot list configmap entries for snapshots without extra metadata

Further Comments

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (f5920d7) 42.19% compared to head (f01765b) 49.99%.
Report is 6 commits behind head on master.

Files	Patch %	Lines
pkg/etcd/s3.go	0.00%	10 Missing ⚠️
pkg/etcd/snapshot_controller.go	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8835      +/-   ##
==========================================
+ Coverage   42.19%   49.99%   +7.80%     
==========================================
  Files         150      150              
  Lines       15790    15798       +8     
==========================================
+ Hits         6662     7898    +1236     
+ Misses       8078     6644    -1434     
- Partials     1050     1256     +206     

Flag	Coverage Δ
e2etests	47.08% <0.00%> (?)
inttests	44.12% <25.00%> (+5.15%)	⬆️
unittests	18.18% <0.00%> (-0.02%)	⬇️

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