plots: log failures during datapoint conversions

[skshetry]

Fixes #9441.

Note that we do merge props, and use that for all revision. So you may see a warning for each revisions.

Example output:

$ dvc plots diff
WARNING: In 'workspace', could not find provided field ('accss') in data fields ('step, acc').                                                                                                                       
WARNING: In 'HEAD', could not find provided field ('accss') in data fields ('step, acc').
file:///home/saugat/projects/iterative/vscode-dvc-demo/dvc_plots/index.html

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (a5dda1b) 90.46% compared to head (4775ca9) 90.46%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9726   +/-   ##
=======================================
  Coverage   90.46%   90.46%           
=======================================
  Files         480      480           
  Lines       36468    36471    +3     
  Branches     5243     5243           
=======================================
+ Hits        32991    32994    +3     
  Misses       2885     2885           
  Partials      592      592           

Impacted Files	Coverage Δ
dvc/render/match.py	98.82% <100.00%> (+0.04%)	⬆️

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