Add test spec demonstrating bug reported in #22428

[jeremygiberson]

This PR adds tests to demonstrate a bug report issue I opened.

• Demonstrates PluginEvents do not support multiple handlers

Additional details

• This PR just adds a spec to demonstrate a bug currently reported.

Steps to test

Run the system tests with the following command: yarn test-system plugin_run_events_multiple_spec.ts

PR Tasks

• Have tests been added/updated?
• [na] Has the original issue (or this PR, if no issue exists) been tagged with a release in ZenHub? (user-facing changes only)
• [na] Has a PR for user-facing changes been opened in cypress-documentation?
• [na] Have API changes been updated in the type definitions?

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[tbiethman]

I moved this to draft while the associated issue is prioritized and corrected. Thanks again @jeremygiberson !

[emilyrohrbough]

@jeremygiberson Thank you so much for the great reproduction! This was super helpful and the info on the linked issue are detailed enough that I think we understand the issue here. I am going to go ahead and close this to clean up the number of PRs open in our queue.