Make automations log prefix more generic

[EvanHahn]

ref https://linear.app/ghost/issue/NY-1260

A quick change for more generic logging.

[coderabbitai]

Walkthrough

A log key constant in the welcome email automations poll service was modified. The constant was changed from '[WELCOME-EMAIL-AUTOMATIONS]' to '[AUTOMATIONS]' on line 35 of the poll.js file. This adjustment affects log event prefixing without altering any functional behavior or public APIs.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: updating the automations log prefix to be more generic.
Description check	✅ Passed	The description is related to the changeset, referencing a Linear issue and explaining the purpose of the change as a logging update.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/update-automations-log-key

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