Make the workflow callback_id generic

[shapirone]

Summary

This makes it so that we respect the value passed into callback_id, rather than treating it as any old string. This is necessary for us to key off of callback_id to know what should be passed into a trigger's workflow parameter in the API.

Testing

There is no functional difference here, but you could test making and deploying workflows for a sanity check.

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

Merging #88 (cc3f6a7) into main (8f53935) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #88   +/-   ##
=======================================
  Coverage   96.10%   96.10%           
=======================================
  Files          41       41           
  Lines        1565     1565           
  Branches       87       87           
=======================================
  Hits         1504     1504           
  Misses         59       59           
  Partials        2        2           

Impacted Files	Coverage Δ
src/workflows/mod.ts	87.75% <ø> (ø)

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[jmplexi]

LGTM