feat(BRE2-756): brev shell external node support

[patelspratik]

brev shell, copy, port-forward, open, and refresh external node support

[codecov]

Codecov Report

❌ Patch coverage is 27.11864% with 215 lines in your changes missing coverage. Please review.
✅ Project coverage is 15.86%. Comparing base (88dc335) to head (9805fb9).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/cmd/portforward/portforward.go	19.64%	45 Missing ⚠️
pkg/cmd/util/externalnode.go	53.65%	38 Missing ⚠️
pkg/cmd/open/open.go	0.00%	34 Missing ⚠️
pkg/cmd/shell/shell.go	0.00%	34 Missing ⚠️
pkg/cmd/refresh/refresh.go	0.00%	27 Missing ⚠️
pkg/cmd/copy/copy.go	0.00%	25 Missing ⚠️
pkg/ssh/sshconfigurer.go	73.52%	7 Missing and 2 partials ⚠️
pkg/cmd/notebook/notebook.go	0.00%	2 Missing ⚠️
pkg/cmd/register/register.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #310      +/-   ##
==========================================
+ Coverage   14.77%   15.86%   +1.09%     
==========================================
  Files         127      129       +2     
  Lines       16977    17417     +440     
==========================================
+ Hits         2508     2763     +255     
- Misses      14182    14351     +169     
- Partials      287      303      +16     

Flag	Coverage Δ
Linux	15.86% <27.11%> (+1.09%)	⬆️

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