Define env key/Value in the cfg.json and define the values in cloud manager config console for every environment.Refer: https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/implementing/deploying/configuring-osgi.html?lang=en#inline-values 

For local sdk: Replication agents are only available to use in the local Quickstart JAR and provide only a simulation of content distribution.Ref: experienceleague.adobe.com/docs/experience-manager-learn/cloud-service/local-development-environment-set-up/aem-runtime.html?lang=en#content-distribution...

Check https://experienceleague.adobe.com/docs/experience-manager-dispatcher/using/configuring/dispatcher-configuration.html?lang=en#configuring-the-dispatcher-cache-cache  

Add redirects at dispatcher level .

Add a custom property in dialog for example ranking and set the value as per your need.And from that value you can decide which image need to be shown first in carousel.

1.How can I sort the pages based on "date last updated"? That will help me prioritize which pages to review first. In sites.html go to list view for sorting .  Also to compare the page you can use ACS commons package /acs-commons/content/page-compare.html  Hope it helps. 

Name field needs to be unique

You need to utilize some OAuth library  Check https://stackoverflow.com/questions/13232697/linkedin-api-authentication-using-java it may help

Check which specific clientlib version is creating issue .Also check the special character in that particular css files ( check formatting) .Hope it will help.

Same issue and tried the methods which you mentioned above but no success.