Add --dry_run to viash [ns] test for generating test scripts - On develop_0_8

[Grifs]

Describe your changes

Add --dry_run for viash ns test and viash test.
This builds the tests without actually executing the tests.

Backported changes from 0.9.

Related issue(s)

Backport of #665

Type of Change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New functionality (non-breaking change which adds functionality)
• Major change (non-breaking change which modifies existing functionality)
• Minor change (non-breaking change which does not modify existing functionality)
• Bug fix (non-breaking change which fixes an issue)
• This change requires a documentation update

Checklist

Requirements:

• I have read the CONTRIBUTING doc.
• I have performed a self-review of my code by checking the "Changed Files" tab.
• My code follows the code style of this project.

Tests:

• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

Documentation:

• Proposed changes are described in the CHANGELOG.md.
• I have updated the documentation accordingly.

Test Environment

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 88.78%. Comparing base (23314ab) to head (9820541).

Files	Patch %	Lines
src/main/scala/io/viash/Main.scala	85.71%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           develop_0_8     #676      +/-   ##
===============================================
+ Coverage        88.76%   88.78%   +0.02%     
===============================================
  Files              120      120              
  Lines             3630     3648      +18     
  Branches           526      527       +1     
===============================================
+ Hits              3222     3239      +17     
- Misses             408      409       +1     

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[tverbeiren]

lgtm!