test: preserve allowCypressEnv in subscription test config rewrites (#33910)

These two subscription tests overwrite the cypress-in-cypress fixture's
cypress.config.js wholesale. The original fixture has `allowCypressEnv: false`,
but the rewrites omitted it — letting the value flip back to its default
`true`. That option is flagged `requireRestartOnChange: 'server'`, so the
config reload triggers initializeActiveProject → OpenProject.create, which
tries to re-bind port 4455 before the previous server has released it.
The result on Mac/Linux is a "Port 4455 is already in use" error mid-test
and the UI gets stuck on the original spec list — the flake we kept seeing
as "Found 17, expected 3".

Preserving allowCypressEnv: false matches the fixture and skips the server
restart entirely.

Author: mschile

packages/app/cypress/e2e/subscriptions/errorWarningChange-subscription.cy.ts

@@ -23,6 +23,7 @@ describe('errorWarningChange subscription', () => {
           await ctx.actions.file.writeFileInProject('cypress.config.js',
 `   
 module.exports = {
+  allowCypressEnv: false,
   projectId: 'abc123',
   component: {
     viewportHeight: '20',
@@ -36,6 +37,7 @@ module.exports = {
           await ctx.actions.file.writeFileInProject('cypress.config.js',
 `   
 module.exports = {
+  allowCypressEnv: false,
   projectId: 'abc123',
   component: {
     viewportHeight: 20,
@@ -53,6 +55,7 @@ module.exports = {
           await ctx.actions.file.writeFileInProject('cypress.config.js',
 `   
 module.exports = {
+  allowCypressEnv: false,
   projectId: 'abc123',
   component: {
     viewportHeight: ,
@@ -67,6 +70,7 @@ module.exports = {
           await ctx.actions.file.writeFileInProject('cypress.config.js',
 `   
 module.exports = {
+  allowCypressEnv: false,
   projectId: 'abc123',
   component: {
     viewportHeight: 20,

packages/app/cypress/e2e/subscriptions/specChange-subscription.cy.ts

@@ -164,6 +164,7 @@ describe('specChange subscription', () => {
         await ctx.actions.file.writeFileInProject('cypress.config.js',
 `   
 module.exports = {
+allowCypressEnv: false,
 projectId: 'abc123',
 experimentalInteractiveRunEvents: true,
 component: {
@@ -312,6 +313,7 @@ e2e: {
         await ctx.actions.file.writeFileInProject('cypress.config.js',
 `   
 module.exports = {
+allowCypressEnv: false,
 projectId: 'abc123',
 experimentalInteractiveRunEvents: true,
 component: {
@@ -436,6 +438,7 @@ e2e: {
         await ctx.actions.file.writeFileInProject('cypress.config.js',
 `   
 module.exports = {
+allowCypressEnv: false,
 projectId: 'abc123',
 experimentalInteractiveRunEvents: true,
 component: {
@@ -461,6 +464,7 @@ e2e: {
         await ctx.actions.file.writeFileInProject('cypress.config.js',
 `   
 module.exports = {
+  allowCypressEnv: false,
   projectId: 'abc123',
   experimentalInteractiveRunEvents: true,
   component: {