Allow viewing long full plan logs directly from web UI

When the full plan logs are too long, you have to download the logs, then view them through a terminal if the logs have ANSI color codes in them.

This is all around a confusing experience, between having to leave Spacelift, then figure out how to view the logs. A searchable log viewer that can handle really long log outputs would be nice. We have legacy Terraform stacks that we don’t want to shard before moving them to Spacelift, and sometimes you just end up with a really long plan, no matter how small your stack is.