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docs: update CONTRIBUTING.md to remove outdated info

Jonathan Braswellrequested to merge
230-contribution-updates into main

General MR

Summary

Removes references to kuttl and confest, as they are not used. Change development branch to main.

Relevant logs/screenshots

Linked Issue

Closes #230 (closed).

Upgrade Notices

N/A

Merge request reports

UNCLASSIFIED - NO CUI