Review workflows needing APP_ID and etc since move to organization

[tupaschoal]

Some workflows are failing, likely because the APP_ID and APP_PRIVATE_KEY are unaccessible (?) such as here:

time-to-leave/.github/workflows/ChangelogUpdater.yml

Lines 19 to 23 in 9be1ea2

	- uses: tibdex/github-app-token@v2
	id: generate-token
	with:
	app_id: ${{ secrets.APP_ID }}
	private_key: ${{ secrets.APP_PRIVATE_KEY }}

We need to make sure this is properly set for it to start working again. Additionally, it seems GH has released an official action for generating tokens, so we should convert to that for security reasons.

https://github.com/actions/create-github-app-token

Here's the path to create a new app https://github.com/organizations/TTLApp/settings/apps/new

[thamara]

I've transferred the APP to the organization and installed it. Now the changelog updater is working as expected. But I'll keep this open as I want to review how we are doing things and how to move to the official token generation.