[CI] Switch aarch64 dashboard run back to nightly (pytorch#136643)

Summary: Reduce the frequency of the aarch64 dashboard CI run since we don't need to monitor its instability anymore.
Pull Request resolved: pytorch#136643
Approved by: https://github.com/huydhn

.github/workflows/inductor-perf-test-nightly-aarch64.yml

@@ -5,9 +5,7 @@ on:
     # - cron: 0 7 * * 1-6
     # - cron: 0 7 * * 0
     # Does not perform max_autotune on CPU, so skip the weekly run setup
-    # Run 6 times everyday to see if perf instablity can be reproduced
-    # Will change this back
-    - cron: 0 */4 * * *
+    - cron: 0 7 * * *
   # NB: GitHub has an upper limit of 10 inputs here
   workflow_dispatch:
     inputs:
@@ -116,7 +114,7 @@ jobs:
     name: linux-jammy-aarch64-py3.10-inductor
     uses: ./.github/workflows/_linux-test.yml
     needs: linux-jammy-aarch64-py3_10-inductor-build
-    if: github.event.schedule == '0 */4 * * *'
+    if: github.event.schedule == '0 7 * * *'
     with:
       build-environment: linux-jammy-aarch64-py3.10
       # Turn off dynamic-shapes and aotinductor tests for now, to have faster iteration for debugging perf instability.