[To Main / DESENG-580] Serialize data for compatibility with new Axios version

[NatSquared]

Issue #: 🎟️ DESENG-580

Description of changes:

• Bugfix: Stop Axios from trying to be a smarty pants and sending data in a format Flask doesn't understand
  • This was preventing the filtering feature from working
  • Directly serialize any metadata filters before the request to avoid Axios's new nested object serialization
  • Deserialize it again on the Flask side

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of the met-public license (Apache 2.0).

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 75.60%. Comparing base (5825b43) to head (7b9df95).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2454      +/-   ##
==========================================
- Coverage   75.60%   75.60%   -0.01%     
==========================================
  Files         582      582              
  Lines       20793    20794       +1     
  Branches     1529     1529              
==========================================
  Hits        15721    15721              
- Misses       4826     4827       +1     
  Partials      246      246              

Flag	Coverage Δ
metapi	88.01% <75.00%> (-0.01%)	⬇️
metweb	63.47% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
met-web/src/components/landing/LandingContext.tsx	16.27% <ø> (ø)
met-web/src/services/engagementService/index.ts	27.77% <ø> (ø)
met-api/src/met_api/resources/engagement.py	98.87% <75.00%> (-1.13%)	⬇️

[Baelx]

Looks good!

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud