Update phpcs fixer to disallow else if and enforce separation of phpdoc tags

[Crabcyborg]

This came up in a review. I'd rather not have to bring this up in review, but I want it to be consistent.

[coderabbitai]

Walkthrough

The change enables the PHP CS Fixer 'elseif' rule in the project configuration, adding it to the existing ruleset. This affects how elseif constructs are formatted and normalized during code style fixing.

Changes

Cohort / File(s)	Summary
PHP CS Fixer Configuration \.php-cs-fixer\.php	Enable the 'elseif' rule to enforce consistent formatting of elseif constructs

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title mentions disallowing 'else if' which aligns with the elseif rule addition, but also references 'phpdoc tags' which is not present in the changeset.	Update the title to focus on the actual change: enabling the PHP CS Fixer 'elseif' rule. Remove the reference to phpdoc tag separation as it's not implemented in this changeset.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description is related to the changeset, indicating the motivation behind enforcing consistent code style for elseif constructs to reduce review comments.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch phpcs_fixer_no_else_if

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