chore: delete embedded trace viewer

[Skn0tt]

We decided not to ship the embedded trace viewer. I have some changes to the trace viewer that broke the tests for it, so this PR removes the code altogether.

[Skn0tt]

cc @ruifigueira. We're dropping your embedded trace viewer feature for maintenance reasons. It's yet another distribution of the trace viewer, and we already have to support so many of them (UI mode, local trace viewer, hosted trace viewer, ...). Adding one more makes it harder for us to maintain, and it seems like the product benefit doesn't offset that. We kept the code for it the past weeks to see if we feel different, but it now started failing some tests for changes we'd like to make.

So we've made the decision to revert - not because of the quality of your work, but because of maintenance overhead. Hope that's OK for you - you did great work on this, and we're more than open to future contributions of yours.

[ruifigueira]

I was a victim of my own code:

microsoft/playwright#33643 (comment)

It's now time to let it go (well, sort of, because git doesn't let, this is probably the equivalent to purgatory).