Multiple-target-in-package support added in 2.5.2 broke git.properties data

[plaird]

In namespacing all springboot macro outputs in #139 I broke support for git.properties files being automatically loaded into the actuator/info endpoint, and any custom use cases users have built for git.properties.

Example: demoapp-git.properties

https://github.com/salesforce/rules_spring/blob/main/springboot/springboot.bzl#L544

The namespaced git.properties filename needs to be renamed to just git.properties as it is copied into the jar. Also, it has been a todo list item to add tests that verify file layouts within the generated springboot jar. Now is a good time to add that.

[plaird]

This issue was resolved by #260.