title: Table CSS lost after copy pasting table on html editor odoo 15
body: <p>Impacted versions: 15</p>
  <p>Steps to reproduce: Click Send Message button and Copy table data from excel or google excel and paste the table from excel</p>
  <p>Current behavior: Data pasted without table border and style color</p>
  <p>Expected behavior: Data of excel should be copied as it is while sending mail from Odoo</p>