Remove legacy Today Extension leftovers

[mokagio]

Stumbled on these files while setting up the Prototype Build.

Here's a screenshot of the leftover scheme, clearly showing the missing target:

To test

Given this removes dead references, green CI will suffice.

Checklist

N.A.:

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.