fix: Improve shell variable quoting in Coverage-Fuzzing templates

Lucas Charlesrequested to merge
fix-quoting-on-coverage-fuzzing-template into master

What does this MR do and why?

Follow-up to !97886 (comment 1107973011)

Templates did not properly quote variables previously, which makes them vulnerable to unanticipated behavior depending on the expanded contents of the variable value.

By properly quoting these we keep our templates safer

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