chore(docs): add empty changeset step to actions (#6377)

- Creates a script that runs the `yarn changeset --empty` command if there are file changes. This is important to not create PRs of just empty changesets if there are no file changes.
- Run script in all docs-generation PRs
- Fix to condition in `generate-docblock` action

docs-util/packages/scripts/run-changeset.ts

@@ -0,0 +1,26 @@
+import util from "node:util"
+import { exec } from "child_process"
+import path from "node:path"
+
+const promiseExec = util.promisify(exec)
+
+async function main() {
+  // check if there are any changes in diff
+  const diffFiles = (await promiseExec(`git diff --name-only`)).stdout
+    .toString()
+    .split("\n")
+    .filter(Boolean)
+
+  if (!diffFiles.length) {
+    console.log("No files were changed, skipping generating changeset...")
+    return
+  }
+
+  // run changeset
+  await promiseExec(`yarn changeset --empty`, {
+    cwd: path.resolve("..", "..", ".."),
+  })
+  console.log("Generated changeset.")
+}
+
+void main()