efficient writes and update tests

[patkivikram]

Description

This PR removes unnecessary writes to the workflow instance thereby reducing callbacks

Type of Change

• Bug Fix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe)

Checklist

• I have read the contributing guidelines
• Existing issues have been referenced (where applicable)
• I have verified this change is not present in other open pull requests
• Functionality is documented
• All code style checks pass
• New code contribution is covered by automated tests
• All new and existing tests pass

[codecov]

Codecov Report

Merging #48 (869e2e7) into main (275530d) will decrease coverage by 0.04%.
The diff coverage is 50.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
- Coverage   86.55%   86.51%   -0.04%     
==========================================
  Files          12       12              
  Lines        1829     1824       -5     
  Branches      214      215       +1     
==========================================
- Hits         1583     1578       -5     
- Misses        145      146       +1     
+ Partials      101      100       -1     

Files Changed	Coverage Δ
dagger/modeler/definition.py	85.65% <0.00%> (-0.78%)	⬇️
dagger/store/stores.py	90.25% <ø> (ø)
dagger/templates/template.py	97.65% <ø> (ø)
dagger/service/services.py	84.55% <100.00%> (ø)
dagger/tasks/task.py	79.37% <100.00%> (+0.11%)	⬆️