fix: validate hcloud volume labels

[lukasmetzner]

Validates Hetzner Cloud labels according to their specification in the API docs: https://docs.hetzner.cloud/reference/cloud#description/labels

If the label value exceeds 63 characters it is truncated from the left.

[codecov]

Codecov Report

❌ Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.14%. Comparing base (05251fb) to head (4e552f6).

Files with missing lines	Patch %	Lines
internal/driver/controller.go	88.23%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1304      +/-   ##
==========================================
+ Coverage   71.56%   73.14%   +1.57%     
==========================================
  Files          17       17              
  Lines        1477     1493      +16     
==========================================
+ Hits         1057     1092      +35     
+ Misses        334      314      -20     
- Partials       86       87       +1     

Flag	Coverage Δ
e2e-controller	58.67% <29.41%> (+2.07%)	⬆️
e2e-node	58.67% <29.41%> (+2.07%)	⬆️
integration	3.26% <0.00%> (-0.05%)	⬇️
unit	41.46% <88.23%> (+0.49%)	⬆️

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[lukasmetzner]

We could add additional steps such as truncating, or truncating + hash.

[lukasmetzner]

We can't put ... in the beginning of the truncation as the API requires us to start with an alphanumeric character.