test: add test for position page states (#6342)

cypress/e2e/position.test.ts

+describe('Position', () => {
+  it('shows an valid state on a supported network', () => {
+    cy.visit('/pools/1')
+    cy.contains('UNI / ETH')
+  })
+
+  it('shows an invalid state on a supported network', () => {
+    cy.visit('/pools/788893')
+    cy.contains('To view a position, you must be connected to the network it belongs to.')
+  })
+})