Change template loop detection strategy to allow self-referencing updates when there are multiple templates

[bdraco]

Proposed change

This reverts #39897

Change template loop detection strategy to allow a self-referencing update

Loop detection now only triggers if we have a sequence of self referencing
updates greater than or equal to the number of templates.

This allows additional attributes in template entities to be self-referencing
as long as all templates in the entity are not self-referencing.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

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# Example configuration.yaml

Additional information

• This PR fixes or closes issue: fixes Template loop detection breaks useful self references in templates #39932
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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[bdraco]

unrelated test failure .. . again FAILED tests/components/light/test_device_trigger.py::test_if_fires_on_state_change[pyloop]