Fix `subresource_name` Property

[ASHR4]

Description

84 reported - `Inappropriate value for attribute "subresource_name": string required.

Reviewing the azurerm provider, the subresource_name property within the ip_configuration block is a string. The subresource_names property within the private_service_connection is a list(string).

This module reuses the list(string) variable causing issues when trying to configure the ip_configuration block.

This PR updates the ip_configuration variable to have its own string subresource_name property and the subresource_name variable used within private_service_connection has been renamed to subresource_names.

This will cause a breaking change for people; required to make subresource_name plural.

Upon having issues with the az_api and seeing the provider does not support the update timeout, I removed the update operation, closing #85 and #78 :)

Closes #78 Closes #84 Closes #85

Type of Change

• [ ] Non-module change (e.g. CI/CD, documentation, etc.)
• [x] Azure Verified Module updates:
  • [ ] Bugfix containing backwards compatible bug fixes, and I have NOT bumped the MAJOR or MINOR version in locals.version.tf.json:
  • [X] Someone has opened a bug report issue, and I have included "Closes #{bug_report_issue_number}" in the PR description.
  • [ ] The bug was found by the module author, and no one has opened an issue to report it yet.
  • [ ] Feature update backwards compatible feature updates, and I have bumped the MINOR version in locals.version.tf.json.
  • [X] Breaking changes and I have bumped the MAJOR version in locals.version.tf.json.
  • [ ] Update to documentation

Checklist

• [X] I'm sure there are no other open Pull Requests for the same update/change
• [X] My corresponding pipelines / checks run clean and green without any errors or warnings
• [X] I did run all pre-commit checks

I did receive errors from the linter in the pr-checks but it seems to be regarding old interfaces and I felt a seperate PR would be more appropriate.