test: update helm install logic for upgrade tests

[aramase]

Signed-off-by: Anish Ramasekar anish.ramasekar@gmail.com

Reason for Change:

• update helm install logic for upgrade tests
  • we can't use charts/csi-secrets-store-provider-azure when cutting releases because the image will be latest and not yet available. So switching the logic to use the official helm chart repo to install the latest available provider.

Requirements

• squashed commits
• included documentation
• added unit tests and e2e tests (if applicable).

Issue Fixed:

Does this change contain code from or inspired by another project?

• Yes
• No

If "Yes," did you notify that project's maintainers and provide attribution?

Special Notes for Reviewers:

[codecov-commenter]

Codecov Report

Merging #1041 (fc28247) into master (d5c8c90) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1041   +/-   ##
=======================================
  Coverage   59.16%   59.16%           
=======================================
  Files          10       10           
  Lines        1097     1097           
=======================================
  Hits          649      649           
  Misses        413      413           
  Partials       35       35           

[aramase]

/azp run pr-e2e-azure

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[aramase]

cherry picked to #1040 and tested: https://dev.azure.com/AzureContainerUpstream/Secrets%20Store%20CSI%20Driver%20Provider%20Azure/_build/results?buildId=68734&view=logs&j=011e1ec8-6569-5e69-4f06-baf193d1351e&t=6d6277c3-ee16-5eeb-e3c1-ca1f5d9ddce6