[Backend] Add Systems Applicable Filter to Privacy Experience List

[pattisdr]

Closes #959

Description Of Changes

If there are no systems in Fides with data uses that are mapped to privacy notices, then those notices shouldn't show up in the experiences.

Adds a ?systems_applicable query param to Privacy Experience List (GET {{host}}/privacy-experience/?systems_applicable=True)

We have this filter on GET Privacy Notices but not on experiences themselves.

Note that the experiences themselves still show up if they exist. If you don't want to see the experience either, use the separate existing flag, ?has_notices=True

Code Changes

• If systems_applicable query param is passed to the GET PrivacyExperienceList endpoint, pass that filter onto the embedded privacy notices to only return notices whose data use corresponds to a system.

Steps to Confirm

• Verify that you have some privacy notices whose data uses match a system's data use and some that don't
• Compare results of GET {{host}}/privacy-experience/ and GET {{host}}/privacy-experience/?systems_applicable=True
  • Note: data uses "match" if they are either an exact match, or the privacy notice's data use is a parent of the system's data use. For example, if the privacy notice has a data use of marketing and the system has a data use of marketing.advertising - that is considered to match. The system's data use is under the scope of a privacy notice. The reverse case is not considered a match.

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
• Update CHANGELOG.md
• For API changes, the Postman collection has been updated

[cypress]

Passing run #2956 ↗︎

0	4	0	0	0
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Details:

Merge 11b9372 into 65a72ff...
Project: fides	Commit: 6f324b16a6 ℹ️
Status: Passed	Duration: 00:45 💡
Started: Jun 28, 2023 7:32 PM	Ended: Jun 28, 2023 7:33 PM

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

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (65a72ff) 87.10% compared to head (11b9372) 87.09%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3654      +/-   ##
==========================================
- Coverage   87.10%   87.09%   -0.01%     
==========================================
  Files         310      310              
  Lines       19048    19052       +4     
  Branches     2438     2439       +1     
==========================================
+ Hits        16592    16594       +2     
- Misses       2028     2029       +1     
- Partials      428      429       +1     

Impacted Files	Coverage Δ
...i/api/v1/endpoints/privacy_experience_endpoints.py	91.80% <ø> (ø)
src/fides/api/models/privacy_experience.py	99.42% <100.00%> (+0.01%)	⬆️

... and 2 files with indirect coverage changes

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[pattisdr]

@allisonking when you have time could you take a look and add the corresponding frontend to this? There's just a new systems_applicable filter for experiences, not just notices!