test(angular): add ng20 test app (#30507)

Issue number: internal

---------

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## What is the current behavior?
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There are tests apps for Angular 16, 17, 18, and 19 only. Angular 20 has
been released and should be included.

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

- Adds a test app for Angular 20

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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## Other information

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screenshots of how the component looks before and after the change. -->

N/A

.github/workflows/actions/test-angular-e2e/action.yml

@@ -8,7 +8,7 @@ runs:
   steps:
     - uses: actions/setup-node@v4
       with:
-        node-version: 18
+        node-version: 22.x
     - uses: ./.github/workflows/actions/download-archive
       with:
         name: ionic-core

.github/workflows/build.yml

@@ -140,7 +140,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        apps: [ng16, ng17, ng18, ng19]
+        apps: [ng16, ng17, ng18, ng19, ng20]
     needs: [build-angular, build-angular-server]
     runs-on: ubuntu-latest
     steps:

.github/workflows/stencil-nightly.yml

@@ -150,7 +150,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        apps: [ng16, ng17, ng18, ng19]
+        apps: [ng16, ng17, ng18, ng19, ng20]
     needs: [build-angular, build-angular-server]
     runs-on: ubuntu-latest
     steps: