Replay Details: error count in header and linking breadcrumbs + events in timeline to error console messages

[jas-kas]

Solution:

1. In the page header, where it shows a Flame Icon with a number next to it, we replace that with a red counter, with a link labelled "Error". By clicking this link, it would automatically filter the console by errors only, and if the user hasn't got the "Console" tab active/in view, it would take the user to that tab.
2. When the user clicks an error in the breadcrumb list or event timeline, it will select the corresponding error in the console view.
3. Keep the Issues tab in Replay Details as is, per the discussion in #38461. We may revisit this in the future.

See designs for this ticket under "Concept B" in this Figma.

See what is labelled 1 in the screenshot: for # 2 go here: https://github.com/getsentry/sentry/issues/38922

This issue closes design ticket #38578.