fix: Use dom-mutator custom package that fixes infinite loop issue

[hthr-lee]

Summary

Nested HTML editing doesn't work with the current implementation of dom-mutator. They just released a version 0.7.1 that we should probably leverage as that has some rate limiting with the number of mutations which run a minute. That being said, it doesn't directly address the issues that we're seeing. Here's the custom dom-mutator changes that we are keying off of: https://github.com/amplitude/dom-mutator/pull/7/files. To address the infinite loop issue, the lines of interest have to do with _textTimeout where if you setTimeout and pause the global mutation observer, then resume it by queueing something quickly in the JS event loop using setTimeout, we batch the changes together so that an element isn't being changed back and forth clobbering each other.

Note

This only works because we don't expect customers to install this package directly. If they do, it'll throw an error because the repo this change points to is private. We only want to use experiment-tag as a project to generate the experiment-script.min.js template that is used by our dynamic script service, and this is called locally from our machines, which do have access to this project.

Checklist

• Does your PR title have the correct title format?
• Does your PR have a breaking change?: no

TODO

• I need to update the github runners to have a ssh key to pull from this repository if we take this approach instead of the patching approach.