5559: Remove stopping ECS tasks from the teardown script

[Rob9786]

Make sure you have checked all steps below.

Issue

• My PR fully resolves the following issues. I've referenced an issue in the PR title, for example "Issue 1234 - My
  Feature". Note that before an issue is finished, you can still make a pull request by raising a separate issue
  for your progress.
  • Resolves Remove stopping ECS tasks from the teardown script #5559

Tests

• My PR adds the following tests based on our test strategy OR does not need testing for this extremely good reason:
  • No additional tests

Documentation

• In case of new functionality, my PR adds documentation that describes how to use it, or I have linked to a
  separate issue for that below.
• If I have added new Java code, I have added Javadoc that explains it following our conventions and style.
• If I have added or removed any dependencies from the project, I have updated the NOTICES file.

[Rob9786]

Span up a test stack and cluster. Started ingesting records. Ran the teardown.sh script. All of the stacks deleted cleanly and the new lambda plus logging worked as expected.

[patchwork01]

It looks like right now this would break the teardown script for all the ECS clusters except for ingest. The new teardown needs applying to the other ECS clusters first, in issue #5566.