Fix #1333: Add repository_password_wo write-only attribute and mark repository_password as sensitive

[dennismdejong]

Description

This PR addresses issue #1333 by adding a new write-only attribute repository_password_wo that allows users to provide repository passwords without storing them in the Terraform plan/state.

Changes

resource_helm_release.go

• Added RepositoryPasswordWO field to HelmReleaseModel struct
• Added repository_password_wo schema attribute with WriteOnly: true
• In Create: resolves password from repository_password_wo (config) when repository_password (plan) is empty
• In Update: same resolution logic
• In chartPathOptions: falls back to repository_password_wo when repository_password is empty

data_helm_template.go

• Added RepositoryPasswordWO field to HelmTemplateModel struct
• Added repository_password_wo schema attribute
• In Read: resolves password from repository_password_wo when repository_password is empty
• In chartPathOptionsModel: falls back to repository_password_wo when repository_password is empty

[MGSousa]

PR already created here: #1761