refactor: split up label command into separate Fetch/GetLabels/GetIDOrName

[phm07]

This change is intended for an upcoming resource that has labels but doesn't have numeric IDs.

[codecov]

Codecov Report

Attention: Patch coverage is 85.33333% with 22 lines in your changes missing coverage. Please review.

Project coverage is 70.20%. Comparing base (0ccd41c) to head (09c9f5d).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/cmd/base/labels.go	70.58%	3 Missing and 2 partials ⚠️
internal/cmd/image/labels.go	76.92%	3 Missing ⚠️
internal/cmd/loadbalancer/labels.go	83.33%	2 Missing ⚠️
internal/cmd/primaryip/labels.go	83.33%	2 Missing ⚠️
internal/cmd/server/labels.go	83.33%	2 Missing ⚠️
internal/cmd/volume/labels.go	83.33%	2 Missing ⚠️
internal/cmd/certificate/labels.go	91.66%	1 Missing ⚠️
internal/cmd/firewall/labels.go	91.66%	1 Missing ⚠️
internal/cmd/floatingip/labels.go	91.66%	1 Missing ⚠️
internal/cmd/network/labels.go	91.66%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #967      +/-   ##
==========================================
+ Coverage   70.01%   70.20%   +0.19%     
==========================================
  Files         245      245              
  Lines       10715    10785      +70     
==========================================
+ Hits         7502     7572      +70     
  Misses       2537     2537              
  Partials      676      676              

Flag	Coverage Δ
e2e	46.85% <52.00%> (+0.06%)	⬆️
unit	63.69% <81.33%> (+0.23%)	⬆️

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[apricote]

Where do you intend to use this? / What is the benefit of this refactor?