Revise service account roles and update commands

[tgelpi]

Updated service account roles and commands for Vault-based deployments.

Description

Vault-based deployments fail due to missing GCP IAM permissions (terraform destroy failure + cluster unable to retrieve secrets)

Fixes #244

Checklist:

• I have mentioned the appropriate type(scope), as referenced here in the commit message and PR title for the semantic checks to pass.
• I have signed off the commit, as per instructions mentioned here.
• Any dependent changes have already been merged.

[jenkins-x-bot]

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[jenkins-x-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[tgelpi]

/assign @Skisocks