Do not create template entities when action validation fails during setup

[Petro31]

Breaking change

Proposed change

When script validation fails, template integration will silently remove the action and still create the entity. This changes the behavior, now an error is logged and the entity is not created.

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)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
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• Tests have been added to verify that the new code works.
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

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• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (template) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

Prevents template entities from being created when action validation fails.

Changes:

• Makes script validation return success status.
• Filters invalid YAML, trigger, and config-entry entities.
• Adds coverage for all action-enabled template platforms.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
homeassistant/components/template/helpers.py	Skips entity creation after validation failure.
tests/components/template/conftest.py	Adds shared invalid-action test helpers.
tests/components/template/test_alarm_control_panel.py	Tests alarm panel actions.
tests/components/template/test_button.py	Tests button actions.
tests/components/template/test_cover.py	Tests cover actions.
tests/components/template/test_fan.py	Tests fan actions.
tests/components/template/test_light.py	Tests light actions.
tests/components/template/test_lock.py	Tests lock actions.
tests/components/template/test_number.py	Tests number actions.
tests/components/template/test_select.py	Tests select actions.
tests/components/template/test_switch.py	Tests switch actions.
tests/components/template/test_update.py	Tests update actions.
tests/components/template/test_vacuum.py	Tests vacuum actions.

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