fix: event listener not being invoked for native web components

[jye-sf]

Details

Addresses https://github.com/salesforce/lwc/issues/4011.

This PR attempts to bypass our addEventListener() patch when working with event targets under a native shadow root.

Remaining work:

• [ ] Do we need to do something similar for removeEventListener() to avoid inconsistent behavior?
• [ ] Investigate and fix test failures on existing tests
• [ ] Refactor and move new tests to appropriate space

Does this pull request introduce a breaking change?

• ✅ No, it does not introduce a breaking change.
• 🚨 Yes, it does introduce a breaking change.

Does this pull request introduce an observable change?

• ⚠️ Yes, it does include an observable change.

This changes the composed path in some scenarios. The full, explicit list of scenarios may need to be explored.

GUS work item