Move get element functionality to a helper (#33327)

Looking around on js components I found out many checks, different expressed but with same purpose.
Some of them are trying to parse string to element, others, jQuery element to js simple nodeElement etc

With this Pr, I am trying to give a standard way to parse an element

So this pr:

* Creates `getElement` helper that tries to parse an argument to element or null
* Changes `isElement` to make  explicit checks and return Boolean 
* fixes tests deficiencies

1 files changed, 2 insertions, 9 deletions

diff --git a/js/src/collapse.js b/js/src/collapse.js
index 1c8f53ebd6..3241a71327 100644
--- a/js/src/collapse.js
+++ b/js/src/collapse.js
@@ -7,9 +7,9 @@
 
 import {
   defineJQueryPlugin,
+  getElement,
   getSelectorFromElement,
   getElementFromSelector,
-  isElement,
   reflow,
   typeCheckConfig
 } from './util/index'
@@ -272,14 +272,7 @@ class Collapse extends BaseComponent {
   _getParent() {
     let { parent } = this._config
 
-    if (isElement(parent)) {
-      // it's a jQuery object
-      if (typeof parent.jquery !== 'undefined' || typeof parent[0] !== 'undefined') {
-        parent = parent[0]
-      }
-    } else {
-      parent = SelectorEngine.findOne(parent)
-    }
+    parent = getElement(parent)
 
     const selector = `${SELECTOR_DATA_TOGGLE}[data-bs-parent="${parent}"]`