cmd/trace: remove the v1 tracer code

[cagedmantis]

The Execution tracer has been overhauled. The remnants of the old execution tracer should be removed.

[gopherbot]

Change https://go.dev/cl/584537 mentions this issue: internal/trace: remove remnanats of v1 tracer

[gopherbot]

Change https://go.dev/cl/584536 mentions this issue: cmd/trace: collapse v2 directory into trace

[gopherbot]

Change https://go.dev/cl/584538 mentions this issue: internal/trace: move v2 tracer into trace directory

[aclements]

Is there anything more to be done here?

[cagedmantis]

i believe this is done. I was just waiting for the post-submits to run before closing the issue. But I will close it now.