[chore] reenable arm testing (#10611)

#### Description
Use the arm64 machines provisioned by
open-telemetry/community#2156

#### Link to tracking issue
Fixes #10606

Author: atoulme

.github/workflows/build-and-test-arm.yml

@@ -23,7 +23,7 @@ concurrency:
 jobs:
   arm-unittest-matrix:
     if: ${{ github.actor != 'dependabot[bot]' && (contains(github.event.pull_request.labels.*.name, 'Run ARM') || github.event_name == 'push' || github.event_name == 'merge_group') }}
-    runs-on: macos-14
+    runs-on: otel-linux-arm64
     steps:
       - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
       - uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
@@ -49,7 +49,7 @@ jobs:
         run: make -j4 gotest
   arm-unittest:
     if: ${{ github.actor != 'dependabot[bot]' && (contains(github.event.pull_request.labels.*.name, 'Run ARM') || github.event_name == 'push' || github.event_name == 'merge_group') }}
-    runs-on: macos-14
+    runs-on: otel-linux-arm64
     needs: [arm-unittest-matrix]
     steps:
       - name: Print result