fix: Exclude precompilation from coverage

[kshyatt-aws]

Issue #, if available: N/A

Description of changes: Exclude the precompilation files from coverage -- these aren't exercised by tests, because they are only run at package install.

Testing done: Unit tests passed locally.

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[krneta]

Is there a way to exclude file patterns (like */precompile.jl) ?

[kshyatt-aws]

Not sure if there's an easy way in the GH action.