Fix DTA iOS compilation, and consume native from xcframework (backport #4151)

[mergify]

This is an automatic backport of pull request #4151 done by Mergify.
Cherry-pick of 6f4d5ec has failed:

On branch mergify/bp/release/3.3.x/pr-4151
Your branch is up to date with 'origin/release/3.3.x'.

You are currently cherry-picking commit 6f4d5ec22d.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   common/config/azure-pipelines/templates/core-build.yaml
	new file:   test-apps/display-test-app/.gitignore
	new file:   test-apps/display-test-app/assets/Settings/Schemas/.empty
	modified:   test-apps/display-test-app/ios/backend.config.js
	modified:   test-apps/display-test-app/ios/imodeljs-test-app/imodeljs-test-app.xcodeproj/project.pbxproj
	modified:   test-apps/display-test-app/ios/imodeljs-test-app/imodeljs-test-app.xcodeproj/project.xcworkspace/contents.xcworkspacedata
	modified:   test-apps/display-test-app/ios/imodeljs-test-app/imodeljs-test-app/AppDelegate.swift
	modified:   test-apps/display-test-app/ios/imodeljs-test-app/imodeljs-test-app/ViewController.swift
	deleted:    test-apps/display-test-app/ios/scripts/installIosNativeLib.js
	modified:   test-apps/display-test-app/package.json

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   common/scripts/update-imodeljs-native-version.sh

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[calebmshafer]

@aruniverse any reason to not get this merged? Just needs reviews?

[aruniverse]

@aruniverse any reason to not get this merged? Just needs reviews?

Yep just needs review. Was waiting on that new addon which has been published before.

[aruniverse]

@pmconne mind taking a pass?