Isolate experimental app router package for testing/building

[blakewilson]

Tasks

• I have signed a Contributor License Agreement (CLA) with WP Engine.
• If a code change, I have written testing instructions that the whole team & outside contributors can understand.
• I have written and included a comprehensive changeset to properly document the changes I've made.

Description

This PR isolates the experimental app router package into its own workflow since this project now requires a minimum of node 18. Since our other packages run on Node 16, the workflows were modified to not build/test this package within the default scripts, and only do it in it's own experimental-app-router.yml workflow.

Additionally, engine-strict was turned off since running npm ci at the root would fail instantly since one of the packages required an out of date engine (i.e. when running workflows on node 16, npm ci would fail because the app router package had engines set to node 18.

Related Issue(s):

Testing

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Latest commit: bb7222d

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