Remove the simulator reset again

It was added on the theory that the runner's reused simulators were leaking state
between runs. That theory was wrong: erasing both devices changed nothing — the
same seven suites failed identically before and after.

The leftover files LoggingTests trips on are its own, from a previous attempt of
the same test within one run (the suite runs with -test-iterations 4), so nothing
crosses runs for an erase to clean. Keeping a step that mutates shared state on the
release machine for no measured benefit is worse than not having it.

.github/workflows/unit-tests.yml

@@ -71,34 +71,6 @@ jobs:
           # of which Xcode built a given run.
           xcodebuild -version
 
-      - name: Reset the test simulators
-        # HealthChat: a hosted VM hands out a fresh simulator every run; this runner reuses the same
-        # devices, so app containers, caches and logs survive between runs. Suites asserting on clean
-        # state then fail on the previous run's leftovers — LoggingTests expects no log files and
-        # finds nine, in the same device container each time.
-        #
-        # Only the two devices the tooling pins are erased (UnitTests.swift, PreviewTests.swift,
-        # CI.swift), never `simctl erase all`: this machine is shared with the release pipeline, and
-        # a blanket wipe would take out simulator state that has nothing to do with this job. A
-        # missing device is not an error — the tooling creates it.
-        run: |
-          set -eu
-          for device in "iPhone 17" "iPhone SE (3rd generation)"; do
-            # Match on a trailing "(" so "iPhone 17" cannot also match "iPhone 17 Pro" — the same
-            # guard the tooling uses when it resolves a device.
-            udid=$(xcrun simctl list devices "iOS 26.5" available \
-                     | grep -F "$device (" \
-                     | grep -oE '[0-9A-F]{8}(-[0-9A-F]{4}){3}-[0-9A-F]{12}' \
-                     | head -1 || true)
-            if [ -n "$udid" ]; then
-              echo "Erasing $device ($udid)"
-              xcrun simctl shutdown "$udid" 2>/dev/null || true
-              xcrun simctl erase "$udid"
-            else
-              echo "$device not present — the tooling will create it"
-            fi
-          done
-
       - name: Run tests
         # HealthChat: previews are skipped. PreviewTests renders a snapshot for every preview in the
         # app and was the entire reason this job could not fit in an hour — it never once finished,