Revert "test: added tests to check that the vary header contains 'RSC' (#1993)"

This reverts commit 124d4ae.

Author: nickytonline

cypress/integration/default/appdir.spec.ts

@@ -29,27 +29,6 @@ describe('appDir', () => {
     })
   })
 
-  it('returns a vary header for RSC data requests to ISR pages', () => {
-    cy.request({
-      url: '/blog/erica/',
-      followRedirect: false,
-      headers: {
-        RSC: '1',
-      },
-    }).then((response) => {
-      expect(response.headers).to.have.property('vary').contains('RSC')
-    })
-  })
-
-  it('returns a vary header for non-RSC data requests to ISR pages', () => {
-    cy.request({
-      url: '/blog/erica/',
-      followRedirect: false,
-    }).then((response) => {
-      expect(response.headers).to.have.property('vary').contains('RSC')
-    })
-  })
-
   it('returns RSC data for RSC requests to static pages', () => {
     cy.request({
       url: '/blog/erica/first-post/',