Change $type of date for todos (#12779)

* change $type to date for task and add new test

* adjust apidocs to reflect type change

* migration test for api date $type change

* minor fixes to migration

* unset instead of set empty string

* add type filter

* fix(todo date migration): make sure the update command works and limit update ops

Co-authored-by: Matteo Pagliazzi <matteopagliazzi@gmail.com>

test/api/v3/integration/tasks/POST-tasks_user.test.js

@@ -220,6 +220,18 @@ describe('POST /tasks/user', () => {
     });
   });
 
+  it('errors if todo due date supplied is an invalid date', async () => {
+    await expect(user.post('/tasks/user', {
+      type: 'todo',
+      text: 'todo text',
+      date: 'invalid date',
+    })).to.eventually.be.rejected.and.eql({
+      code: 400,
+      error: 'BadRequest',
+      message: 'todo validation failed',
+    });
+  });
+
   context('sending task activity webhooks', () => {
     before(async () => {
       await server.start();