perf(sentry): Add experimental UI element tag for interaction transactions

[0Calories]

Adds an experimental tag to interaction transactions that contains the element that was interacted with. This will allow us to query and aggregate transactions by a DOM element.

Please note that this is only for experimental purposes and will be removed later on.

Example of what this looks like on a transaction:

[k-fish]

Okay, based on the limited number of indexed events and the limit of clickable elements in the dom, this is unbounded but should be small enough card. Before we remove the experiment we need to check about promoting this to a column though.