lapi: return specific error if a unix socket path is too long for the OS

[mmetc]

give the user a hint on what's happening (nothing more we can do) and make sure the tests don't fail for the same reason.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

Details

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[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

Project coverage is 57.66%. Comparing base (a79b92f) to head (ca36baf).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/csnet/socket.go	75.00%	3 Missing ⚠️
pkg/acquisition/modules/appsec/appsec.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3593      +/-   ##
==========================================
- Coverage   57.67%   57.66%   -0.01%     
==========================================
  Files         394      395       +1     
  Lines       43969    43981      +12     
==========================================
+ Hits        25359    25362       +3     
- Misses      16474    16480       +6     
- Partials     2136     2139       +3     

Flag	Coverage Δ
bats	42.63% <71.42%> (-0.01%)	⬇️
unit-linux	32.83% <0.00%> (-0.01%)	⬇️
unit-windows	22.34% <0.00%> (-0.02%)	⬇️

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[LaurenceJJones]

lgtm