Remove FullStory

[mbeacom]

Description

The goal of this PR is to eliminate the fetching/usage of the FullStory JS library since we're actively using Hotjar.

Checklist

• linter status: 100% pass
• changes don't break existing behavior
• commit message follows commit guidelines

Affected core subsystem(s)

analytics, fullstory

Testing

Locally

[codecov]

Codecov Report

Merging #2009 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2009   +/-   ##
=======================================
  Coverage   25.36%   25.36%           
=======================================
  Files         132      132           
  Lines       10891    10891           
  Branches     1456     1456           
=======================================
  Hits         2763     2763           
  Misses       8052     8052           
  Partials       76       76

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