ci: disable c8 coverage for Node 25 to work around yargs breakage#2785

Copilot wants to merge 2 commits intodependabot/npm_and_yarn/main/c8-11.0.0kubernetes-client/javascript:dependabot/npm_and_yarn/main/c8-11.0.0from

copilot/sub-pr-2779-againkubernetes-client/javascript:copilot/sub-pr-2779-againCopy head branch name to clipboard