Fail on templated service data

[emontnemery]

Proposed change

Templated service data is difficult to use, because when used in automations or scripts, an attempt is made to prematurely render the template.

The workaround is to encapsulate the template in a string: #40241 (comment)

The purpose of this PR is to get an idea of how many services support templated data, and it should not be merged

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[MartinHjelmare]

It's generally better if the caller has the check and we make the parameter non optional. That will save a function call and make the function signature simpler.

[github-actions]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days.
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