Restore missing icon-plot-scatter and icon-derived-telemetry icons

[charlesh88]

• Restored deleted class for .icon-plot-scatter.
• Rebuilt missing glyph art for icon-derived-telemetry in font JSON file, renewed font files.
• DO NOT MERGE THIS COMMIT - JUST ACCEPT IT!!!

Testing Notes

1. Create a Scatter Plot: verify that it displays an icon in the tree.

2. If possible, perform that same check as above in the Create menu in a deployment with Derived Telemetry installed. I was not able to install Derived Telemetry; verified instead by editing the main view icon in Chrome Inspector to change its class to 'icon-derived-telemetry':

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Is this a notable change that will require a special callout in the release notes? For example, will this break compatibility with existing APIs or projects that consume these plugins?

Author Checklist

• Changes address original issue?
• Tests included and/or updated with changes?
• Has this been smoke tested?
• Have you associated this PR with a type: label? Note: this is not necessarily the same as the original issue.
• Have you associated a milestone with this PR? Note: leave blank if unsure.
• Testing instructions included in this PR?

Reviewer Checklist

• Changes appear to address issue?
• Reviewer has tested changes by following the provided instructions?
• Changes appear not to be breaking changes?
• Appropriate automated tests included?
• Code style and in-line documentation are appropriate?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.31%. Comparing base (98a5b22) to head (c2cbe4d).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8267      +/-   ##
==========================================
+ Coverage   57.30%   57.31%   +0.01%     
==========================================
  Files         725      725              
  Lines       29291    29291              
  Branches     2795     2795              
==========================================
+ Hits        16784    16788       +4     
+ Misses      12167    12163       -4     
  Partials      340      340              

Flag	Coverage Δ
e2e-ci	64.50% <ø> (+0.08%)	⬆️
e2e-full	40.27% <ø> (+0.02%)	⬆️
unit	46.85% <ø> (ø)
see 4 files with indirect coverage changes

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[akhenry]

Looks good to me!

DO NOT MERGE THIS COMMIT - JUST ACCEPT IT!!!

ok! I accept.