Avoid /opt/intel when backing up, restoring, and mounting fs mount points on arm instances

[dreambeyondorange]

Tests

• Ran updated integration tests, test_internal_efs, on both x86 and arm instance types. The integ test now includes both and arm and an intel instance type

References

• Test internal efs on arm and x86 aws-parallelcluster#6231

Checklist

• Make sure you are pointing to the right branch.
• If you're creating a patch for a branch other than develop add the branch name as prefix in the PR title (e.g. [release-3.6]).
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

Please review the guidelines for contributing and Pull Request Instructions.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.