chore: add deprecation warning on setting app.allowRendererProcessReuse to false (#22337)

* chore: add deprecation warning on setting app.allowRendererProcessReuse to false

* fix: no deprecation warnings in process reuse spec

* chore: add test for new deprecate removeProperty behavior

spec-main/api-deprecate-spec.ts

@@ -83,6 +83,30 @@ describe('deprecate', () => {
     expect(msg).to.include(prop)
   })
 
+  it('deprecates a property of an but retains the existing accessors and setters', () => {
+    let msg
+    deprecate.setHandler(m => { msg = m })
+
+    const prop = 'itMustGo'
+    let i = 1
+    const o = {
+      get itMustGo () {
+        return i
+      },
+      set itMustGo (thing) {
+        i = thing + 1
+      }
+    }
+
+    deprecate.removeProperty(o, prop)
+
+    expect(o[prop]).to.equal(1)
+    expect(msg).to.be.a('string')
+    expect(msg).to.include(prop)
+    o[prop] = 2
+    expect(o[prop]).to.equal(3)
+  })
+
   it('warns exactly once when a function is deprecated with no replacement', () => {
     let msg
     deprecate.setHandler(m => { msg = m })