chore(header/p2p): improve logging

[vgonkivs]

Overview

Change the logging level in the case when headers are not found in the store.

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[codecov-commenter]

Codecov Report

Merging #1520 (1d8285e) into main (8b71eaf) will decrease coverage by 0.39%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1520      +/-   ##
==========================================
- Coverage   55.44%   55.05%   -0.40%     
==========================================
  Files         204      208       +4     
  Lines       12147    12757     +610     
==========================================
+ Hits         6735     7023     +288     
- Misses       4743     5020     +277     
- Partials      669      714      +45     

Impacted Files	Coverage Δ
header/p2p/server.go	66.93% <100.00%> (+0.81%)	⬆️
nodebuilder/share/module.go	58.73% <0.00%> (-18.36%)	⬇️
share/empty.go	86.66% <0.00%> (-13.34%)	⬇️
nodebuilder/share/constructors.go	92.10% <0.00%> (-7.90%)	⬇️
nodebuilder/p2p/flags.go	65.82% <0.00%> (-1.65%)	⬇️
nodebuilder/p2p/network.go	100.00% <0.00%> (ø)
share/p2p/shrexeds/options.go	40.74% <0.00%> (ø)
share/p2p/shrexeds/client.go	69.41% <0.00%> (ø)
share/p2p/shrexeds/server.go	62.26% <0.00%> (ø)
... and 5 more

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