[Feature] Should rmenv GitHub auth tokens

[matthew-cline]

The GitHub command line app (gh) uses GitHub personal access tokens. These can be passed to gh via environmental variables:

• GH_TOKEN
• GITHUB_TOKEN
• GH_ENTERPRISE_TOKEN
• GITHUB_ENTERPRISE_TOKEN

These should be rmenv'd somewhere. Perhaps in disable-passwdmgr.inc?

[rusty-snake]

Keep in mind that even if you rmenv them, a sandbox can still read the file where they are set if this file is not blacklisted or has no whitelist (in whitelisting profiles).

[kmk3]

For future reference, the rmenv entries were moved to disable-common.inc
on #4461.