Support branch policy merge types

[matt-FFFFFF]

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Description

Add support for restricting the merge types available for a branch:

• Squash
• Rebase
• Basic (no ff)
• Rebase with merge

New or Affected Resource(s)

• Resource: azuredevops_branchpolicy_merge_types

Potential Terraform Configuration

resource "azuredevops_branch_policy_merge_types" "p" {
  project_id = azuredevops_project.p.id

  enabled  = true
  blocking = true

  settings {
    allow_squash = true
    allow_rebase_and_fast_forward = true
    allow_basic_no_fast_forward = true
    allow_rebase_with_merge = true

    scope {
      repository_id  = azuredevops_git_repository.p.id
      repository_ref = "refs/heads/main"
      match_type     = "Exact"
    }
  }
}