chore: enable JSX in Cypress tests

[ilhan007]

Enable JSX syntax in Cypress tests, further improving the test dev experience as we get TS checks and auto completion for the web components.

Note: From now on, any changes to tests or creating new tests should use jsx for test mounting, instead of lit-html. As the same syntax rules apply as in the component templates, there is nothing new to learn and switching is straightforward.

Before:

cy.mount(html`<ui5-card>
	  <ui5-card-header
                  id="cardHeader2"
		  slot="header"
		  additional-text="4 of 10"
		  title-text="Quick Links"
		  subtitle-text="Quick links sub title"
		  interactive
	  >
	  </ui5-card-header>
       </ui5-card>
`);

After:

cy.mount(<Card>
	  <CardHeader
		  id="cardHeader1"
		  slot="header"
		  additionalText="4 of 10"
		  titleText="Quick Links"
		  subtitleText="Quick links sub title"
		  interactive={true}
	  >
	  </CardHeader>
       </Card>
);