git_ui: Support "Open Pull Request" for more platforms (#33833)

Hello! It would be great to be able to use the "Open Pull Request"
button that appears after pushing a branch via the git UI on more
platforms (I use Gitlab day to day). Would you be open to adding more
variations of the PR hint text?

I've added the text that Gitlab and Bitbucket use in their push logs
here.

Release Notes:

- Git UI: Support "Open Pull Request" for more platforms

crates/git_ui/src/remote_output.rs

@@ -120,7 +120,18 @@ pub fn format_output(action: &RemoteAction, output: RemoteCommandOutput) -> Succ
         }
         RemoteAction::Push(branch_name, remote_ref) => {
             if output.stderr.contains("* [new branch]") {
-                let style = if output.stderr.contains("Create a pull request") {
+                let pr_hints = [
+                    // GitHub
+                    "Create a pull request",
+                    // Bitbucket
+                    "Create pull request",
+                    // GitLab
+                    "create a merge request",
+                ];
+                let style = if pr_hints
+                    .iter()
+                    .any(|indicator| output.stderr.contains(indicator))
+                {
                     let finder = LinkFinder::new();
                     let first_link = finder
                         .links(&output.stderr)
@@ -154,3 +165,109 @@ pub fn format_output(action: &RemoteAction, output: RemoteCommandOutput) -> Succ
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_push_new_branch_pull_request() {
+        let action = RemoteAction::Push(
+            SharedString::new("test_branch"),
+            Remote {
+                name: SharedString::new("test_remote"),
+            },
+        );
+
+        let output = RemoteCommandOutput {
+            stdout: String::new(),
+            stderr: String::from(
+                "
+                Total 0 (delta 0), reused 0 (delta 0), pack-reused 0 (from 0)
+                remote:
+                remote: Create a pull request for 'test' on GitHub by visiting:
+                remote:      https://example.com/test/test/pull/new/test
+                remote:
+                To example.com:test/test.git
+                 * [new branch]      test -> test
+                ",
+            ),
+        };
+
+        let msg = format_output(&action, output);
+
+        if let SuccessStyle::PushPrLink { link } = &msg.style {
+            assert_eq!(link, "https://example.com/test/test/pull/new/test");
+        } else {
+            panic!("Expected PushPrLink variant");
+        }
+    }
+
+    #[test]
+    fn test_push_new_branch_merge_request() {
+        let action = RemoteAction::Push(
+            SharedString::new("test_branch"),
+            Remote {
+                name: SharedString::new("test_remote"),
+            },
+        );
+
+        let output = RemoteCommandOutput {
+            stdout: String::new(),
+            stderr: String::from("
+                Total 0 (delta 0), reused 0 (delta 0), pack-reused 0 (from 0)
+                remote:
+                remote: To create a merge request for test, visit:
+                remote:   https://example.com/test/test/-/merge_requests/new?merge_request%5Bsource_branch%5D=test
+                remote:
+                To example.com:test/test.git
+                 * [new branch]      test -> test
+                "),
+        };
+
+        let msg = format_output(&action, output);
+
+        if let SuccessStyle::PushPrLink { link } = &msg.style {
+            assert_eq!(
+                link,
+                "https://example.com/test/test/-/merge_requests/new?merge_request%5Bsource_branch%5D=test"
+            );
+        } else {
+            panic!("Expected PushPrLink variant");
+        }
+    }
+
+    #[test]
+    fn test_push_new_branch_no_link() {
+        let action = RemoteAction::Push(
+            SharedString::new("test_branch"),
+            Remote {
+                name: SharedString::new("test_remote"),
+            },
+        );
+
+        let output = RemoteCommandOutput {
+            stdout: String::new(),
+            stderr: String::from(
+                "
+                To http://example.com/test/test.git
+                 * [new branch]      test -> test
+                ",
+            ),
+        };
+
+        let msg = format_output(&action, output);
+
+        if let SuccessStyle::ToastWithLog { output } = &msg.style {
+            assert_eq!(
+                output.stderr,
+                "
+                To http://example.com/test/test.git
+                 * [new branch]      test -> test
+                "
+            );
+        } else {
+            panic!("Expected ToastWithLog variant");
+        }
+    }
+}