Don't exclude local.* files from build artifact

[geerlingguy]

I spent a good deal of time today trying to figure out why some configuration on my deploy environments differed from the configuration in my local environment—there was some config_split module configuration for the local environment (which needed to be on all environments) that disappeared from dev/stage/prod, causing local build failures.

I was also speaking to another developer, @msherron, who had a similar issue with some local task (e.g. the tabs on a node page) configuration that went missing from build artifacts.

The local.* gitignore and deploy-exclude.txt default configuration is a bit heavy-handed, as it will block out configuration/feature exports including any file with names like something.local.yml.