Fix: workbenches e2e test. Use PVC Display Name

[FedeAlonso]

https://issues.redhat.com/browse/RHOAIENG-18051

Description

As the issue with the PVC showing it's name instead of the Display Name in the UI (https://issues.redhat.com/browse/RHOAIENG-16239) has been fixed, we need to update the Workbenches test.
It's been failing in the lasts nightlies

How Has This Been Tested?

$ npx cypress run --spec "**/workbenches.cy.ts" --browser chrome

Test Impact

Fix for workbenches.ct.ts test

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[antowaddle]

/lgtm

[antowaddle]

/approved

[openshift-ci]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.80%. Comparing base (3ea00fd) to head (829ab28).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3638      +/-   ##
==========================================
- Coverage   85.82%   85.80%   -0.03%     
==========================================
  Files        1419     1419              
  Lines       32644    32644              
  Branches     9167     9167              
==========================================
- Hits        28018    28011       -7     
- Misses       4626     4633       +7     

see 3 files with indirect coverage changes

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