Don't require full CI when `.github/` is the only change (and others)

This might also require policy changes on nodejs/node, but for PRs changing Actions we don't need to run full CI. Same goes for PRs changing CODEOWNERS, or linter rules, among other files. I suggest we create a .jenkinsignore file or something on nodejs/node so we can store the rules there instead of here.

该 issue 提到了一个提议中的 .jenkinsignore 文件以及 nodejs/node 中的策略变更。首先检查当前如何定义完整 CI 的决策，以及 nodejs/node 如何处理 Actions、CODEOWNERS 和 linter-rule 变更。完成的标准是：已达成一致的规则可以针对这些变更跳过完整 CI，并覆盖其他预期的文件类别。