E2E: Capture coverage of K3s subcommands

[dereknola]

Proposed Changes

• Make all commands called with RunCmdOnNode use sudo. 95% of the commands already using "sudo"
• If called for, inject GOCOVERDIR before running the k3s <subcommand>. This enables coverage capture of pkg/cli. So all the calls to k3s secrets-encrypt or k3s etcd-snapshot are now captured by the coverage reports.

Types of Changes

E2E Testing improvements

Verification

CodeCov went up

Further Comments

Will backport the sudo commit, not the coverage changes (older branches don't have go 1.20)

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +4.39 🎉

Comparison is base (e5e1a67) 47.55% compared to head (29edc75) 51.95%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7686      +/-   ##
==========================================
+ Coverage   47.55%   51.95%   +4.39%     
==========================================
  Files         141      141              
  Lines       14347    14358      +11     
==========================================
+ Hits         6823     7459     +636     
+ Misses       6442     5719     -723     
- Partials     1082     1180      +98     

Flag	Coverage Δ
e2etests	49.90% <ø> (?)
inttests	44.83% <ø> (-0.10%)	⬇️
unittests	19.90% <ø> (+0.03%)	⬆️

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see 44 files with indirect coverage changes

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