build: variable for resource names specific to Nutanix

[dkoshkin]

What this PR does / why we need it:
This driver can be deployed along side other COSI drivers. The name objectstorage-provisioner is too generic, renamed it to the name Helm variable.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

How Has This Been Tested?:

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration and test output

Followed the README to deploy the Chart.

$ kubectl apply -f https://raw.githubusercontent.com/nutanix-cloud-native/cosi-driver-nutanix/0afb5969e236f6476b501bf3de9dd7cd96727716/project/examples/awscliapppod.yaml

$ kubectl logs awscli
Defaulted container "awscli" out of: awscli, write-aws-credentials (init), write-test-file (init)
+ aws s3 ls
2024-12-26 17:17:02 sample-bucketclass97876066-3b2e-4235-9da7-2a4310320529
++ cat /tmp/test-directory/file.txt
+ readonly BUCKET_NAME=sample-bucketclass97876066-3b2e-4235-9da7-2a4310320529
+ BUCKET_NAME=sample-bucketclass97876066-3b2e-4235-9da7-2a4310320529
++ date +%Y%m%d_%H%M%S
+ readonly FILE_NAME=20241226_171741.txt
+ FILE_NAME=20241226_171741.txt
+ aws s3 cp /tmp/test-directory/file.txt s3://sample-bucketclass97876066-3b2e-4235-9da7-2a4310320529/20241226_171741.txt
upload: ../tmp/test-directory/file.txt to s3://sample-bucketclass97876066-3b2e-4235-9da7-2a4310320529/20241226_171741.txt
+ aws s3 cp s3://sample-bucketclass97876066-3b2e-4235-9da7-2a4310320529/20241226_171741.txt -
sample-bucketclass97876066-3b2e-4235-9da7-2a4310320529

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note: