fix(appointments): validate availability input

[Kumar-s75]

Summary

• Validate appointment availability timezone identifiers.
• Reject malformed weekday slot containers and slots with non-integer or reversed timestamps.
• Add regression tests for invalid timezone, day, and slot values.

Fixes #8859.

Testing

• php -l lib/Controller/AppointmentConfigController.php
• php -l tests/php/unit/Controller/AppointmentConfigControllerTest.php
• git diff --check
• PHPUnit could not run locally because the phpunit executable is not available in the workspace.

[SebastianKrupinski]

Hi @Kumar-s75

Thank you for the PR

[Kumar-s75]

Addressed in commit 2a6874454. Removed the redundant !is_array($slot) condition as suggested; the existing isset() and type checks remain unchanged. PHP syntax and diff checks pass locally. The focused PHPUnit test is still blocked because phpunit is not available in this checkout.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[SebastianKrupinski]

Addressed in commit 2a6874454. Removed the redundant !is_array($slot) condition as suggested; the existing isset() and type checks remain unchanged. PHP syntax and diff checks pass locally. The focused PHPUnit test is still blocked because phpunit is not available in this checkout.

Looks like removing the array check made psalm unhappy. I dropped the second commit