Use use_default_shell_env whenever possible

[mrmeku]

What type of PR is this?

Uncomment one line below and remove others.

Bug fix

What does this PR do? Why is it needed?
This PR makes all actions use use_default_shell_env when possible.
This change is needed to increase the likelyhood of cache hits from rule_go actions

Fixes #1531

[jayconrod]

Sorry, I can't accept this. use_default_shell_env makes actions less hermetic and less likely to be cached. It should only be used when an external tool needs to be invoked with custom flags, or when an internal toolchain can't be configured correctly. #1531 definitely doesn't justify this.