[ty] Add separate CI job for memory usage stats (#19134)

## Summary

As discussed in https://github.com/astral-sh/ruff/pull/19059.

scripts/mypy_primer.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+
+echo "Enabling mypy primer specific configuration overloads (see .github/mypy-primer-ty.toml)"
+mkdir -p ~/.config/ty
+cp .github/mypy-primer-ty.toml ~/.config/ty/ty.toml
+
+PRIMER_SELECTOR="$(paste -s -d'|' $PRIMER_SELECTOR)"
+
+echo "new commit"
+git rev-list --format=%s --max-count=1 "$GITHUB_SHA"
+
+MERGE_BASE="$(git merge-base "$GITHUB_SHA" "origin/$GITHUB_BASE_REF")"
+git checkout -b base_commit "$MERGE_BASE"
+echo "base commit"
+git rev-list --format=%s --max-count=1 base_commit
+
+cd ..
+
+echo "Project selector: $PRIMER_SELECTOR"
+# Allow the exit code to be 0 or 1, only fail for actual mypy_primer crashes/bugs
+uvx \
+  --from="git+https://github.com/hauntsaninja/mypy_primer@e5f55447969d33ae3c7ccdb183e2a37101867270" \
+  mypy_primer \
+  --repo ruff \
+  --type-checker ty \
+  --old base_commit \
+  --new "$GITHUB_SHA" \
+  --project-selector "/($PRIMER_SELECTOR)\$" \
+  --output concise \
+  --debug > $DIFF_FILE || [ $? -eq 1 ]
+
+# Output diff with ANSI color codes
+cat $DIFF_FILE
+
+# Remove ANSI color codes before uploading
+sed -ie 's/\x1b\[[0-9;]*m//g' $DIFF_FILE