Default Stanza to prevent issues post-search-removal

[ljstella]

Spoke w/ @pyth0n1c about this approach to prevent catching unwanted defaults from the system level. Creating this as a start.

[pyth0n1c]

We have done lots of offline discussion, review, and testing around this. So approving, even though CICD is having some issues due to Github infrastrcuture problems at the moment

[cob16]

For future readers upgrading to v5.5.11 please note if you are moving to this version you will need to update your app_template the same way as splunk/security_content#3815
Otherwise the defaults will become global and this will disable all non contentctl saved searches in your instance.

@ljstella
I think it would help if the example change in splunk/security_content#3815 was linked in the v5.5.11 release notes. Yes we should have seen this coming when reviewing the changelog but I think this is going to catch quite a few people out that don't realize that app configs can pollute global configuration in this way and adds a bit of a nice warning to help others from making the same mistake in a similar way to #472 .