fix(payload_api, git_diff): Accessing correct property in payload and Replacing --quiet with --no-patch in git diff (#1934)

src/commitSha.ts

@@ -429,7 +429,7 @@ export const getSHAForPullRequestEvent = async (
 
   if (
     !github.context.payload.pull_request?.base?.ref ||
-    github.context.payload.head?.repo?.fork === 'true'
+    github.context.payload.pull_request?.head?.repo?.fork === true
   ) {
     diff = '..'
   }

src/utils.ts

@@ -908,7 +908,7 @@ export const canDiffCommits = async ({
   } else {
     const {exitCode, stderr} = await exec.getExecOutput(
       'git',
-      ['diff', '--quiet', sha1, sha2],
+      ['diff', '--no-patch', sha1, sha2],
       {
         cwd,
         ignoreReturnCode: true,