Commits on Mar 23, 2021

1. Set -source 8 -target 8 in the open-source build, and remove Java8U… …

   …sage.
   
   This is largely a rollback of the original Java8Usage change, but I've modified it in a few ways:
   
   - I set `-source 8 -target 8` in the backport.
   - I kept the code to make includes/excludes fully work with maven-compiler-plugin, since that could save us some confusion down the line.
   - I incorporated a rollback of the changes to Preconditions from CL 361700569, in which I moved the warning from MoreObjects to Preconditions.
   - I added errors to our internal release scripts so that we don't accidentally make a release that drops Java 7 support before we're ready.
   
   Fixes #5269
   
   PiperOrigin-RevId: 364405695

   

   cpovirk authored and Google Java Core Libraries committed Mar 23, 2021
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