Prevent calling #hasAttribute or #getAttribute in element constructor

follow up of #10045

**Reason**
customElement's `#createdCallback()` is called when the element is created, while `#connectedCallback()` is called when the element is first connected to DOM.

We construct an AMP Element in `createdCallback()`. Using DOM API in element's constructor is DOM API before adding element to DOM, thus should be forbidden.

**Failing Example**
In the following example, when `element.getAttribute()` is called before `#setAttribute()`
```
class AmpTest extends AMP.BaseElement {
constructor(element) {
this.url = element.getAttribute('url);
}
}
```

```
const ele = document.createElement('amp-test');
/** AmpTest constructor gets called when element is created. At this point `` element's attributes are not ready yet */
ele.setAttribute('url', 'fakeurl');
```

Start by reading the follow-up issue #10045 and the AMP.BaseElement lifecycle around createdCallback() and connectedCallback(). Reproduce the failing example with AmpTest, then verify that element constructors no longer call hasAttribute() or getAttribute() before attributes are set.

Written by the indexing model from the issue text.