Examples: Set channelOptions to disallow function serialization

[shilman]

Issue: N/A

What I did

Update the examples to use allowFunction: false for improved security

How to test

N/A

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[ndelangen]

Odd, I'd expect this to fix the issue because:

storybook/lib/channel-postmessage/src/index.ts

Lines 78 to 97 in c61f83d

	const eventOptions = Object.fromEntries(
	Object.entries({
	allowRegExp,
	allowFunction,
	allowSymbol,
	allowDate,
	allowUndefined,
	allowClass,
	maxDepth,
	space,
	lazyEval,
	}).filter(([k, v]) => typeof v !== 'undefined')
	);
	const stringifyOptions = {
	...defaultEventOptions,
	...(global.CHANNEL_OPTIONS || {}),
	...eventOptions,
	};

[shilman]

@ndelangen FYI I merged in #18164 to test out that change