Update form text colors (#3296)

* Create ant variables and update form colors

* Remove less extension from imports in ant.less

* Update font-weight for labels

* Add percy snapshot for create data source page

* Remove bold in labels only for checkboxes and radio buttons

cypress/integration/data-source/create_data_source_spec.js

@@ -14,5 +14,6 @@ describe('Create Data Source', () => {
     cy.getByTestId('Database Name').type('postgres{enter}');
 
     cy.contains('Saved.');
+    cy.percySnapshot('Create Data Source page');
   });
 });