feat: add --no-generate flag to stack creation

[katcipis]

Reason for This Change

Provide a way to disable code generation when creating stacks.

[codecov]

Codecov Report

Base: 72.05% // Head: 72.02% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (f6e153a) compared to base (068a128).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #742      +/-   ##
==========================================
- Coverage   72.05%   72.02%   -0.03%     
==========================================
  Files          73       73              
  Lines       12112    12116       +4     
==========================================
  Hits         8727     8727              
- Misses       3046     3050       +4     
  Partials      339      339              

Flag	Coverage Δ
tests	72.02% <0.00%> (-0.03%)	⬇️

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Impacted Files	Coverage Δ
cmd/terramate/cli/cli.go	0.00% <0.00%> (ø)

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