ui/custom-metadata: Refactor taxonomy to use a single form submission flow

[ssangervasi]

Closes #2545

Code Changes

• This is a large refactor to get taxonomy and custom fields working together. See description below and my line comments.

Steps to Confirm

• Cypress tests!
• From various taxonomy tabs
  • Assign custom fields
  • Single-select
    • Initial selection
    • Change selection
    • Clear selection
    • See value on reload
  • Multi-select
    • Initial selection
    • Change selection
    • Clear selection
    • See value on reload
• Those steps, but from the "Describe system" tab

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation:
  • documentation complete, PR opened in fidesdocs
  • documentation issue created in fidesdocs
• Issue Requirements are Met
• Relevant Follow-Up Issues Created
  • Might be spun out: Custom metadata UI bug roundup #2545 (comment)
  • BE: Endpoint for updating all custom field values for a resource #2612
• Update CHANGELOG.md

Description Of Changes

• I'm tired. When I finish my self-review I'll check this box.

[cypress]

Passing run #127 ↗︎

0

3

0

0

0

Details:

Merge bbcf0a4 into 4bf8330...
Project: fides	Commit: 623cc3966e ℹ️
Status: Passed	Duration: 00:45 💡
Started: Feb 15, 2023 7:55 PM	Ended: Feb 15, 2023 7:56 PM

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}

[codecov]

Codecov Report

Base: 85.91% // Head: 85.91% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (bbcf0a4) compared to base (4bf8330).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2586      +/-   ##
==========================================
- Coverage   85.91%   85.91%   -0.01%     
==========================================
  Files         285      285              
  Lines       15496    15496              
  Branches     1947     1947              
==========================================
- Hits        13314    13313       -1     
  Misses       1799     1799              
- Partials      383      384       +1     

Impacted Files	Coverage Δ
src/fides/api/ops/task/graph_task.py	90.90% <0.00%> (-0.33%)	⬇️

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[chriscalhoun1974]

lgtm

[allisonking]

whew, nice job!!