Remove Matomo and adjust libchat injections into remote app boostrapping

[adamshire123]

Why these changes are being introduced

• Matomo tracking code was causing Firefox to freeze and display a warning about the page slowing Firefox down, so we are removing it completely.

  • How we already tried to resolve the issue:
    • Adding the tracking code during bootstrapping
    • Adding the tracking code in custom.js
    • Disabling the "Enhanced Tracking Protection" in Firefox
  • Primo NDE uses mixpanel for tracking UI interactions which should cover the majority of
    what we would have used Matomo for.

• We also want to avoid conflicts with libchat widget script injection and the remote app bootstrapping

How this addresses that need

• Removes Matomo tracking code injection
• Moves the libchat injection point after the remote app is bootstrapped

Side effects of this change

None

How can reviewer(s) test

new code is live here https://mit-psb.primo.exlibrisgroup.com/nde/fulldisplay?query=compendex&tab=all&search_scope=all&searchInFulltext=false&vid=01MIT_INST:NDE&lang=en&docid=alma990008888900106761&adaptor=Local%20Search%20Engine&context=L&isFrbr=false&isHighlightedRecord=false&state=

• doesn't freeze in firefox
• libchat widget works

Relevant ticket(s)

https://mitlibraries.atlassian.net/browse/NDE-3
https://mitlibraries.atlassian.net/browse/NDE-4