feat(BRE2-1054): uptake ssh certs for registered node

[patelspratik]

• uptake SSH into External Node via SSH Certs
• this presumes the external node has already been enabled and has the CA
  • the work to write the CA will be done in a separate PR

[codecov]

Codecov Report

❌ Patch coverage is 68.05556% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.10%. Comparing base (17ccd79) to head (013a210).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/cmd/mintcert/mintcert.go	56.52%	20 Missing ⚠️
pkg/ssh/sshconfigurer.go	87.50%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #458      +/-   ##
==========================================
+ Coverage   24.67%   27.10%   +2.42%     
==========================================
  Files         134      138       +4     
  Lines       18337    19213     +876     
==========================================
+ Hits         4525     5208     +683     
- Misses      13335    13469     +134     
- Partials      477      536      +59     

Flag	Coverage Δ
Linux	27.10% <68.05%> (+2.42%)	⬆️

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[patelspratik]

this was causing the feature flag to not work correctly