fix(sdk): Reports API: Fix backend name mapping for ScatterPlots

[andrewtruong]

Description

This PR:

1. Fixes ScatterPlot to use the Parallel Coordinates Plot style of backend metric naming
2. Updates ParallelCoordinatesMetric to SummaryOrConfigOnlyMetric to be more explicit about supported metric types

• I updated CHANGELOG.md, or it's not applicable

Testing

How was this PR tested?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.81%. Comparing base (07f19a6) to head (bbaca47).
Report is 59 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7667      +/-   ##
==========================================
+ Coverage   74.28%   75.81%   +1.53%     
==========================================
  Files         500      500              
  Lines       55658    54054    -1604     
==========================================
- Hits        41345    40983     -362     
+ Misses      13907    12664    -1243     
- Partials      406      407       +1     

Flag	Coverage Δ
func	41.39% <0.00%> (+0.02%)	⬆️
system	63.43% <100.00%> (-0.05%)	⬇️
unit	56.40% <100.00%> (+1.01%)	⬆️

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Files	Coverage Δ
wandb/apis/reports/v2/interface.py	87.63% <100.00%> (+0.83%)	⬆️

... and 107 files with indirect coverage changes