Visual alignment on workflow canvas

[mtuchi]

Plans

• Fix add new job button on hover position
• Workflow canvas draggable

Related issue

Fixes #733

Checklist before requesting a review

• I have performed a self-review of my code
• I have verified that all appropriate authorization policies have been implemented and tested
• If needed, I have updated the changelog
• Amber has QA'd this feature

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@84bfeed). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #773   +/-   ##
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  Coverage        ?   92.79%           
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  Files           ?      165           
  Lines           ?     3900           
  Branches        ?        0           
=======================================
  Hits            ?     3619           
  Misses          ?      281           
  Partials        ?        0           

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