[Release 1.26] Add context to flannel errors

[manuelbuil]

Backport: #8284
Issue: #8417

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (4e21728) 19.47% compared to head (6c4c157) 19.47%.
Report is 2 commits behind head on release-1.26.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.26    #8420   +/-   ##
=============================================
  Coverage         19.47%   19.47%           
=============================================
  Files                83       83           
  Lines              5606     5606           
=============================================
  Hits               1092     1092           
  Misses             4288     4288           
  Partials            226      226           

Flag	Coverage Δ
unittests	19.47% <0.00%> (ø)

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Files Changed	Coverage Δ
pkg/agent/flannel/flannel.go	0.00% <0.00%> (ø)

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