Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[x] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofix to a rule
[ ] Add a CLI option
[ ] Add something to the core
[ ] Other, please explain:

The preserve-caught-error rule was producing false positives when a caught error was re-thrown using a quoted or computed static "cause" key. For example:

try {
    doSomething();
} catch (error) {
    throw new Error("Something failed", { "cause": error });
}

Previously, the rule only recognized unquoted identifier keys and would incorrectly report that the caught error was not preserved.

What changes did you make? (Give an overview)

• Replaced the manual property checks with astUtils.getStaticPropertyName(prop) === "cause" to correctly handle all static "cause" keys (unquoted, quoted, and computed).
• Added tests covering different forms of static "cause" keys, both valid and invalid.

Is there anything you'd like reviewers to focus on?