refactor(ivy): use ɵɵ instead of Δ for now (#29850)

The `Δ` caused issue with other infrastructure, and we are temporarily
changing it to `ɵɵ`.

This commit also patches ts_api_guardian_test and AIO to understand `ɵɵ`.

PR Close #29850

packages/compiler-cli/test/compliance/mock_compiler_spec.ts

@@ -140,7 +140,7 @@ describe('mock_compiler', () => {
     expectEmit(
         result.source, `
     // TODO: this comment should not be taken into account
-    $r3$.Δtext(0, "Hello!");
+    $r3$.ɵɵtext(0, "Hello!");
     // TODO: this comment should not be taken into account
     `,
         'todo comments should be ignored');