fix: rename storageClass to storageClassName based in docs and comments

[afzouni]

Description

In the values.yaml and README.md, it mentions defining storageClassName to use a custom storageClassName. However, the variable in statefulset.yaml uses storageClass instead. This pull request changes storageClass to storageClassName to ensure consistency and proper functionality.

Issues Resolved

• No specific issue number, but this change addresses the inconsistency between the documentation and the statefulset.yaml file regarding the storageClassName.

Check List

• [* ] Commits are signed per the DCO using --signoff

For any changes to files within Helm chart directories:

• Helm chart version bumped
• Helm chart CHANGELOG.md updated to reflect change

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[jfreeland]

this should be fixed

[peterzhuamazon]

Adding @TheAlgo to take a look since this looks like a rollover when we migrate from devops repo to helm-charts repo.

cc: @prudhvigodithi

Hi @afzouni have you tested this change and confirm it failed before your change, but succeed after you apply the fix?
Thanks.

[afzouni]

Hi @peterzhuamazon, yes, I tested it. Before the change, it failed, but after setting the storageClassName (I used longhorn in my case), it worked successfully.

[peterzhuamazon]

Adding @prudhvigodithi to take a look, I am ok with this one.
Will need to update the version number and such soon.

Thanks.

[peterzhuamazon]

Updated changelog and charts version and rebased on main.

Thanks.