[Backend] Remove Automatic SafeStr serialization from PrivacyExperienceConfig.

[pattisdr]

Closes #3301

Code Changes

• Escape experience configs before saving in the db. Unescape before returning.
• Escape default experience configs before saving from yaml file
• Unescape embedded experience configs and privacy notices in the PrivacyExperience response
• Unescape notices in the response before returning after create and update.

Steps to Confirm

• Save suspicious characters when creating or updating ExperienceConfigs in various string fields: POST {host}}/experience-config or PATCH {{host}}/experience-config/{{experience-config-id}} - and verify that when you fetch these experience configs, that the strings are unescaped (but they are escaped in the db)
• Also privacy notices embedded in an experience with odd characters are unescaped {{host}}/privacy-experience/?region=us_ca

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

Description Of Changes

Strings that are escaped on ExperienceConfigs are currently surfaced in their escaped form.

[cypress]

Passing run #2780 ↗︎

0	4	0	0	0
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Details:

Merge 9af8689 into 9cddb24...
Project: fides	Commit: e67c57385f ℹ️
Status: Passed	Duration: 01:02 💡
Started: Jun 19, 2023 4:37 PM	Ended: Jun 19, 2023 4:38 PM

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

[pattisdr]

@allisonking requesting your review because I believe it was your pattern I followed from notices!

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.40 🎉

Comparison is base (9cddb24) 86.66% compared to head (9af8689) 87.06%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3600      +/-   ##
==========================================
+ Coverage   86.66%   87.06%   +0.40%     
==========================================
  Files         310      310              
  Lines       18988    19002      +14     
  Branches     2421     2427       +6     
==========================================
+ Hits        16455    16544      +89     
+ Misses       2107     2029      -78     
- Partials      426      429       +3     

Impacted Files	Coverage Δ
...rc/fides/api/api/v1/endpoints/dataset_endpoints.py	96.29% <100.00%> (ø)
...1/endpoints/privacy_experience_config_endpoints.py	100.00% <100.00%> (ø)
...i/api/v1/endpoints/privacy_experience_endpoints.py	91.80% <100.00%> (+0.73%)	⬆️
...s/api/api/v1/endpoints/privacy_notice_endpoints.py	100.00% <100.00%> (ø)
src/fides/api/api/v1/endpoints/utils.py	81.96% <100.00%> (ø)
src/fides/api/models/datasetconfig.py	96.69% <100.00%> (ø)
src/fides/api/schemas/privacy_experience.py	100.00% <100.00%> (ø)
src/fides/api/util/consent_util.py	99.43% <100.00%> (+<0.01%)	⬆️
src/fides/api/util/data_category.py	100.00% <100.00%> (ø)

... and 7 files with indirect coverage changes

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[allisonking]

Nice, works great! we'll need to pass the special header in privacy center and fides-js too, otherwise it looks like this 😅

ticket here: #3606

but works great in admin-ui which is passing the header!