Raw logs (from GitLab ci) contain lots of unnecessary progress information

e.g. the log from https://gitlab.com/trustable/distros/minimal-distro/-/jobs/84011212

has

[36m[2m[[0m[33m00[0m[36m[2m:[0m[33m00[0m[36m[2m:[0m[33m24[0m[36m[2m][[0m[33m[22m9a2d34ab[0m[36m[2m][[0m[33mbuild[0m[36m[2m:[0m[33mgnu-toolchain/stage1-gcc.bst  [0m[36m[2m] [0m[32m[1m[2mSUCCESS[0m[36m[2m [0mRunning strip-commands
[36m[2m[[0m[33m00[0m[36m[2m:[0m[33m00[0m[36m[2m:[0m[33m24[0m[36m[2m][[0m[33m[22m9a2d34ab[0m[36m[2m][[0m[33mbuild[0m[36m[2m:[0m[33mgnu-toolchain/stage1-gcc.bst  [0m[36m[2m] [0m[32m[1m[2mSUCCESS[0m[36m[2m [0mRunning strip-commands
[36m[2m[[0m[33m--[0m[36m[2m:[0m[33m--[0m[36m[2m:[0m[33m--[0m[36m[2m][[0m[33m[22m9a2d34ab[0m[36m[2m][[0m[33mbuild[0m[36m[2m:[0m[33mgnu-toolchain/stage1-gcc.bst  [0m[36m[2m] [0m[34m[1m[2mSTART  [0m[36m[2m [0mCaching artifact
[36m[2m[[0m[33m00[0m[36m[2m:[0m[33m00[0m[36m[2m:[0m[33m01[0m[36m[2m][[0m[33m[22m9a2d34ab[0m[36m[2m][[0m[33mbuild[0m[36m[2m:[0m[33mgnu-toolchain/stage1-gcc.bst  [0m[36m[2m] [0m[32m[1m[2mSUCCESS[0m[36m[2m [0mCaching artifact
[36m[2m[[0m[33m00[0m[36m[2m:[0m[33m05[0m[36m[2m:[0m[33m57[0m[36m[2m][[0m[33m[22m9a2d34ab[0m[36m[2m][[0m[33mbuild[0m[36m[2m:[0m[33mgnu-toolchain/stage1-gcc.bst  [0m[36m[2m] [0m[32m[1m[2mSUCCESS[0m[36m[2m [0m[33m[2mbaserock/gnu-toolchain-stage1-gcc/9a2d34ab-build.32303.log[0m
[36m[2m[[0m[33m--[0m[36m[2m:[0m[33m--[0m[36m[2m:[0m[33m--[0m[36m[2m][[0m[33m[22mf4712828[0m[36m[2m][[0m[33mbuild[0m[36m[2m:[0m[33mgnu-toolchain/stage1.bst      [0m[36m[2m] [0m[34m[1m[2mSTART  [0m[36m[2m [0m[33m[2mbaserock/gnu-toolchain-stage1/f4712828-build.5516.log[0m
```

etc