Colorize third-party stubtest and stubsabot outputs in CI (#9432)

Author: AlexWaygood

.github/workflows/stubsabot.yml

@@ -10,6 +10,9 @@ permissions:
   issues: write
   pull-requests: write
 
+env:
+  FORCE_COLOR: 1
+
 jobs:
   stubsabot:
     name: Upgrade stubs with stubsabot

.github/workflows/stubtest_third_party.yml

@@ -14,6 +14,7 @@ permissions:
 env:
   PIP_DISABLE_PIP_VERSION_CHECK: 1
   FORCE_COLOR: 1
+  TERM: xterm-256color  # needed for FORCE_COLOR to work on mypy on Ubuntu, see https://github.com/python/mypy/issues/13817
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}