[DPE-8062] Enable microceph test for arm64

[marceloneppel]

Issue

The test that checks the backup on microceph runs only for AMD64.

Solution

Change the pinned revision to a channel and enable the test for ARM64.

Checklist

• I have added or updated any relevant documentation.
• I have cleaned any remaining cloud resources from my accounts.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.09%. Comparing base (cab9d43) to head (8c3af12).
⚠️ Report is 7 commits behind head on 16/edge.

❌ Your project status has failed because the head coverage (65.09%) is below the target coverage (70.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff            @@
##           16/edge    #1126   +/-   ##
========================================
  Coverage    65.09%   65.09%           
========================================
  Files           17       17           
  Lines         4277     4277           
  Branches       654      654           
========================================
  Hits          2784     2784           
  Misses        1318     1318           
  Partials       175      175           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.