Add support for policy_update_patterns in policy_set

[nithishravindra]

Description

Add PolicyUpdatePatterns support for policy sets (read/create/update) and tests

Remember to:

• Update the Change Log
• Update the Documentation

Testing plan

1. Describe how to replicate
2. the conditions
3. under which your code performs its purpose,
4. including example Terraform configs where necessary.

External links

Include any links here that might be helpful for people reviewing your PR. If there are none, feel free to delete this section.

• go-tfe documentation
• go-tfe-PR
• API documentation
• Related PR

Output from acceptance tests

Please run applicable acceptance tests locally and include the output here. See testing.md to learn how to run acceptance tests.

If you are an external contributor, your contribution(s) will first be reviewed before running them against the project's CI pipeline.

resource "tfe_policy_set" "dummy_patterns" {
  name                = "dummy-policy-set-update-patterns"
  description         = "Dummy policy set for update pattern testing"
  organization        = data.tfe_organization.test.name
  kind                = "sentinel"
  agent_enabled       = true
  policy_tool_version = "0.24.1"
  workspace_ids       = ["ws-x"]
  policy_update_patterns = [
    "policies/dummy-policy-set/*",
    "sentinel/*.sentinel",
  ]

  vcs_repo {
    identifier                 = "xxx/xxx"
    ingress_submodules         = false
    github_app_installation_id = "ghain-xxx"
  }
}

output "dummy_policy_set_id" {
  value = tfe_policy_set.dummy_patterns.id
}

...

Rollback Plan

Changes to Security Controls

[sana-faraz]

nit: iteration can be moved to another function and reused

[sana-faraz]

nit: Can be rewitten like

fields := []string{
    "name", "description", "global", "vcs_repo", 
    "overridable", "agent_enabled", "policy_tool_version", 
    "policy_update_patterns",
}

hasAnyChange := false
for _, field := range fields {
    if d.HasChange(field) {
        hasAnyChange = true
        break
    }
}

if hasAnyChange {
    ....
}