[release-3.8][Spack] Changing the default Spack Root directory from /home to /opt

[himani2411]

Description of changes

• Changing the default location of Spack root folder from /home to /opt/parallelcluster/shared

Tests

• Locally Creating an AMI and testing to install SW using Spack

develop -> #2494

References

• Link to impacted open issues.
• Link to related PRs in other packages (i.e. cookbook, node).
• Link to documentation useful to understand the changes.

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.

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (af41687) 76.06% compared to head (9690562) 76.06%.

Additional details and impacted files

@@             Coverage Diff              @@
##           release-3.8    #2519   +/-   ##
============================================
  Coverage        76.06%   76.06%           
============================================
  Files               13       13           
  Lines             1876     1876           
============================================
  Hits              1427     1427           
  Misses             449      449           

Flag	Coverage Δ
unittests	76.06% <ø> (ø)

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