Fix bug passing params to workflows

[dbwiddis]

Description

Fixes two bugs with parameter substitution:

• Method arguments for previous node inputs and user params were swapped when executing workflows. This wasn't obvious because of a "catch all" fallback when previous node inputs isn't included, that got them anyway
• When provisioning via create workflow REST API, the new workflow request didn't pass along the params map

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.91%. Comparing base (2707210) to head (731f244).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #559      +/-   ##
============================================
+ Coverage     72.81%   72.91%   +0.09%     
  Complexity      675      675              
============================================
  Files            79       79              
  Lines          3451     3452       +1     
  Branches        273      273              
============================================
+ Hits           2513     2517       +4     
+ Misses          822      818       -4     
- Partials        116      117       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.