Remove instances of non-inclusive language from the Firefox Reality code base

[bluemarvin]

Configuration

Firefox Reality version: All

Current Behavior

Mozilla is removing non-inclusive language from the code base. See https://bugzilla.mozilla.org/show_bug.cgi?id=1644823 for reference.

I did a quick search of FxR code base and found a few instances we should fix. The biggest issue is the main github repository branch is called master. Renaming that will be a larger effort as there are taskcluster process that unfortunately depend on this name.

Expected Behavior

FxR should use only inclusive language in the code.

Possible Solution

Rename problematic language.