feat(pr): add changeType field to files JSON output

Add the changeType field from the PullRequestChangedFile GraphQL type
to the PullRequestFile struct. This exposes the file status (added,
modified, deleted, renamed, copied, changed) in gh pr list --json files
and gh pr view --json files output.

Closes #11385

api/queries_pr.go

@@ -296,9 +296,10 @@ type PullRequestCommitCommit struct {
 }
 
 type PullRequestFile struct {
-	Path      string `json:"path"`
+	Path       string `json:"path"`
-	Additions int    `json:"additions"`
+	Additions  int    `json:"additions"`
-	Deletions int    `json:"deletions"`
+	Deletions  int    `json:"deletions"`
+	ChangeType string `json:"changeType"`
 }
 
 type ReviewRequests struct {

api/query_builder.go

@@ -148,7 +148,8 @@ var prFiles = shortenQuery(`
 		nodes {
 			additions,
 			deletions,
-			path
+			path,
+			changeType
 		}
 	}
 `)

api/query_builder_test.go

@@ -26,7 +26,7 @@ func TestPullRequestGraphQL(t *testing.T) {
 		{
 			name:   "compressed query",
 			fields: []string{"files"},
-			want:   "files(first: 100) {nodes {additions,deletions,path}}",
+			want:   "files(first: 100) {nodes {additions,deletions,path,changeType}}",
 		},
 		{
 			name:   "invalid fields",
@@ -72,7 +72,7 @@ func TestIssueGraphQL(t *testing.T) {
 		{
 			name:   "compressed query",
 			fields: []string{"files"},
-			want:   "files(first: 100) {nodes {additions,deletions,path}}",
+			want:   "files(first: 100) {nodes {additions,deletions,path,changeType}}",
 		},
 		{
 			name:   "projectItems",