replace 'cluster.up' by 'cluster.apply' in demo-notebooks

[LilyLinh]

Issue link

Jira link

What changes have been made

Changed cluster.up() to cluster.apply() in Demo Notebooks

Verification steps

N/A

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • Testing is not required for this change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.47%. Comparing base (f9f8671) to head (6b2a10f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #861   +/-   ##
=======================================
  Coverage   92.47%   92.47%           
=======================================
  Files          24       24           
  Lines        1396     1396           
=======================================
  Hits         1291     1291           
  Misses        105      105           

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[pawelpaszki]

great job. thanks!

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pawelpaszki

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