feat: prompt agent to follow PR template when create new PR (#7698)

Author: xingyaoww

frontend/__tests__/components/chat/action-suggestions.test.tsx

@@ -98,7 +98,7 @@ describe("ActionSuggestions", () => {
     const pushBranchPrompt =
       "Please push the changes to a remote branch on GitHub, but do NOT create a pull request. Please use the exact SAME branch name as the one you are currently on.";
     const createPRPrompt =
-      "Please push the changes to GitHub and open a pull request. Please create a meaningful branch name that describes the changes.";
+      "Please push the changes to GitHub and open a pull request. Please create a meaningful branch name that describes the changes. If a pull request template exists in the repository, please follow it when creating the PR description.";
 
     // Verify the prompts are different
     expect(pushBranchPrompt).not.toEqual(createPRPrompt);

frontend/src/components/features/chat/action-suggestions.tsx

@@ -38,7 +38,7 @@ export function ActionSuggestions({
     }, but do NOT create a ${pr}. Please use the exact SAME branch name as the one you are currently on.`,
     createPR: `Please push the changes to ${
       isGitLab ? "GitLab" : "GitHub"
-    } and open a ${pr}. Please create a meaningful branch name that describes the changes.`,
+    } and open a ${pr}. Please create a meaningful branch name that describes the changes. If a ${pr} template exists in the repository, please follow it when creating the ${prShort} description.`,
     pushToPR: `Please push the latest changes to the existing ${pr}.`,
   };