Prevent GitHub from displaying comments within JSON files as errors (#7043)

Marshall Bowers created

This PR adds a `.gitattributes` rule to prevent GitHub from displaying
comments within JSON files as errors.

We have a number of JSON files (e.g., settings) that make use of
comments, and having a bunch of red in a diff is annoying.

Release Notes:

- N/A

Change summary

.gitattributes | 2 ++
1 file changed, 2 insertions(+)

Detailed changes

.gitattributes 🔗

@@ -0,0 +1,2 @@
+# Prevent GitHub from displaying comments within JSON files as errors.
+*.json linguist-language=JSON-with-Comments