fix: non-processible error when empty body is sent to fastAPI (#10248)

[jordanrfrazier]

• Fix non-processible erro when empty body is sent to fastAPI

• Annotate FlowDataRequest with Body for embedding

• Refine requestBody type for vertex order retrieval

• [autofix.ci] apply automated fixes

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Cherrypick from 5ea316d 5ea316d

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• Commit unit tests in branch fix-fastapi-issue

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[lucaseduoli]

LGTM! tested and working

[github-actions]

Frontend Unit Test Coverage Report

Coverage Summary

Lines	Statements	Branches	Functions
	9.58% (2522/26307)	3.9% (793/20313)	4.04% (229/5660)

Unit Test Results

Tests	Skipped	Failures	Errors	Time
831	0 💤	0 ❌	0 🔥	16.142s ⏱️

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release-1.6.5@78b4134). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
.../queries/vertex/use-post-retrieve-vertex-order.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##             release-1.6.5   #10253   +/-   ##
================================================
  Coverage                 ?   35.78%           
================================================
  Files                    ?     1221           
  Lines                    ?    58297           
  Branches                 ?     5549           
================================================
  Hits                     ?    20863           
  Misses                   ?    37273           
  Partials                 ?      161           

Flag	Coverage Δ
backend	55.73% <ø> (?)
frontend	8.81% <0.00%> (?)

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

Files with missing lines	Coverage Δ
.../queries/vertex/use-post-retrieve-vertex-order.tsx	0.00% <0.00%> (ø)

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