fix(kt-devnet): use dash as network separator

[sigma]

Description

This follow ethpandaops/optimism-package#337
Kurtosis labels are unfortunately limited in the characters they can use.

Tests

Additional context

Metadata

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.95%. Comparing base (1809039) to head (832677b).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #16455      +/-   ##
===========================================
- Coverage    46.97%   43.95%   -3.02%     
===========================================
  Files         1394     1233     -161     
  Lines       112732   103849    -8883     
===========================================
- Hits         52957    45651    -7306     
+ Misses       56047    54607    -1440     
+ Partials      3728     3591     -137     

Flag	Coverage Δ
cannon-go-tests-64	?
contracts-bedrock-tests	?

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Files with missing lines	Coverage Δ
kurtosis-devnet/pkg/kurtosis/endpoints.go	92.55% <100.00%> (ø)

... and 167 files with indirect coverage changes

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