Revert "[lldb] Implement coalescing of disjoint progress events (#84854)"

This reverts commit 930f64689c1fb487714c3836ffa43e49e46aa488 as it's
failing on the Linux bots.

GitOrigin-RevId: 4dcb1db44f9dbfa09c220703a1b097f51d20a2a5
4 files changed