Minor: Update the testing section of contributor guide #6357
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Which issue does this PR close?
N/A
Rationale for this change
@mustafasrepo and I had a good conversation on #6234 (#6234 (comment)) about the rationale for sqllogictests and I wanted to include a summary of that discussion in the docs
What changes are included in this PR?
Update the contribution guide to be clearer about tests and the why of DataFusion using sqllogictests
Are these changes tested?
N/A
Are there any user-facing changes?
Docs