Hard delete template translations that no longer exist on the channel side

[rowanseymour]

We don't often hard delete anything but:

1. These aren't things people are authoring in RP - they can always be re-synced from the channel if they still exist
2. Marking things as inactive and then active again is kinda weird
3. The thing you probably should be able to soft delete is the template.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: temba/channels/models.py

Function	Unhandled Issue
release	Exception: Unable to update call to action: {"error":{"message":"Error validating access token: The session ... ... Event Count: 2

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (3235a29) to head (cd0b5c6).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5360   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          488       488           
  Lines        25042     25038    -4     
=========================================
- Hits         25042     25038    -4     

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