chore: add post merge validation bot

Author: jvbriones

.github/workflows/post-merge-validation.yml

@@ -63,25 +63,27 @@ jobs:
 
             const body = `Hi @${author},
 
-            This PR has been merged to the main branch. Please ensure the following validation steps are completed.
-            Please use power user persona where performance might be a challenge.
+            on the day following \`feat\` or \`perf\` PR merge, PM and author to test changes on main (feature + exploratory around the edges) using the latest [nightly build](https://consensys.slack.com/archives/C093JQSEPJL) with [casual user persona](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/400085221547/Mobile+User+Persona+Definition) and also a [power user persona](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/400085221547/Mobile+User+Persona+Definition) where performance might be a challenge. Please record the testing in a video, check the relevant post-merge checklist box below, and post the video in a comment at the bottom of this PR.
 
-            ## Validation Checklist
-            - [ ] Author validated the changes in main branch using the nightly build
-            - [ ] PM of the team validated the changes in main branch using the nightly build            
-            - [ ] Video URL shared: 
+            ### Author validation checklist
+            - [ ] Validated the changes in main branch using the nightly build
+            - [ ] Video shared
+
+            ### PM validation checklist
+            - [ ] Validated the changes in main branch using the nightly build
+            - [ ] Video shared
 
             <!-- AUTO-VALIDATION-CHECKLIST PR:${pull_number} -->`;
 
             // Post the comment
             try {
-             await github.rest.issues.createComment({
+            await github.rest.issues.createComment({
               owner,
               repo,
               issue_number: pull_number,
               body
-             });
-             console.log(`✅ Validation checklist posted on PR #${pull_number}`);
+            });
+            console.log(`✅ Validation checklist posted on PR #${pull_number}`);
             } catch (error) {
               console.log(`⚠️  Could not post comment: ${error.message}`);
             }