refactor(angular): remove angular 14 and 15 dependencies (#29169)

Issue number: Internal

---------

<!-- Please do not submit updates to dependencies unless it fixes an
issue. -->

<!-- Please try to limit your pull request to one type (bugfix, feature,
etc). Submit multiple pull requests if needed. -->

## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

With Ionic 8 we are dropping Angular 14 and 15 support.

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

- This PR officially drops Angular 14 and 15 support.
Note: The work to do this was done a while ago, but this branch was
never merged into `feature-8.0`. The breaking change was already noted
in the breaking change guide, so this is not an additional breaking
change on top of what was already specified.


## Does this introduce a breaking change?

- [x] Yes
- [ ] No

<!--
  If this introduces a breaking change:
1. Describe the impact and migration path for existing applications
below.
  2. Update the BREAKING.md file with the breaking change.
3. Add "BREAKING CHANGE: [...]" to the commit description when merging.
See
https://github.com/ionic-team/ionic-framework/blob/main/.github/CONTRIBUTING.md#footer
for more information.
-->


## Other information

<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->

---------

Co-authored-by: Brandy Carney <brandyscarney@users.noreply.github.com>
Co-authored-by: Maria Hutt <thetaPC@users.noreply.github.com>
Co-authored-by: Amanda Johnston <90629384+amandaejohnston@users.noreply.github.com>

.github/workflows/build.yml

@@ -140,7 +140,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        apps: [ng14, ng15, ng16, ng17]
+        apps: [ng16, ng17]
     needs: [build-angular, build-angular-server]
     runs-on: ubuntu-latest
     steps: