Update URL for the event link

### Problem Statement

Sometimes people want to share an event they are looking at with someone else. Sometimes they want to share it with Sentry engineers to show a problem with the product.

By opening an issue from the Issues page, the link looks like this: `https://sentry-sdks.sentry.io/issues/2862440042/?project=5428557&query=is%3Aunresolved%20issue.priority%3A%5Bhigh%2C%20medium%5D&referrer=issue-stream&sort=date&statsPeriod=1h&stream_index=3` which is the link to the overall issue.

But let’s say the first issue that appears to me already has something interesting that I want to share. I click in the address bar, ctrl+C, and share it.
If another event of this same issue happens, that new event will be the one that will appear when we open the link, and not the event with the interesting information, and now the other event is lost among the many events being created.

I know that we have a `copy link to this issue event` button, but using that button is not the user's first instinct. We have received many links to the issue instead of to the event.

### Solution Brainstorm

Change the URL to the event link after opening the issue.

### Product Area

Issues

Start at the Issues page by opening an issue with multiple events and reproducing the address-bar sharing behavior described here. Trace the event-selection and URL update flow; done means opening the issue updates the URL to the selected event so a shared link returns to that event rather than a newer one.

Written by the indexing model from the issue text.