[IMP] web: remove es5 shim

The library es5 shim was usefull for older browsers that do not implement
completely the es5 specifications, like IE9.

As we do not support browsers older than IE11, that fully supports all
the features of es5, the library has become useless.

Removing this library will remove a little bit of noise in the callstack
when debugging.

closes odoo/odoo#27877

addons/web/static/tests/fields/basic_fields_tests.js

@@ -2254,7 +2254,7 @@ QUnit.module('basic_fields', {
                 var evt = document.createEvent("MouseEvents"); //taken ref from https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/initMouseEvent
                 evt.initMouseEvent("mouseover", true, true, window, 0, 0, 0, 80, 20, false, false, false, false, 0, null);
                 $('.discreteBar')[0].dispatchEvent(evt);
-                var tooltip = $('.nvtooltip').find('table').find('.key')[0].innerText;
+                var tooltip = $('.nvtooltip').find('table').find('.key')[0].innerText.trim();
                 assert.equal(tooltip, graph_key, "graph tooltip should be generated ");
                 $('.nvtooltip').remove();