Removes deprecated MS Teams webhook methods and integration tests

[Godmartinz]

This removes all deprecated MS Teams integration tests and check in and check out methods. Webhooks were deprecated Jan 31st, 2025.

Updates the warning messages to be past tense if an old webhook URL is still stored:

Also, a warning will be returned before trying and failing to send the notification, item will still be checked in/out though:

[what-the-diff]

PR Summary

• Updated Deprecation Message for Microsoft Teams Webhook
  The system message concerning Microsoft Teams webhook's status has been updated to clarify that it's already deprecated.
• Added Checks to Prevent Webhook Notifications in Specific Cases
  In our CheckoutableListener.php file, a check has been put in place prohibiting webhook notifications when the webhook endpoint includes 'workflows'.
• Modified Warning in SlackSettingsForm.php to Reflect Current Status
  The warning message in the SlackSettingsForm.php file has been revised to indicate the latest deprecation status of the Microsoft Teams webhook.
• Removed Deprecated Webhook Logic from Notification Classes
  Obsolete logic related to webhooks has been removed from six notification classes including CheckinAccessoryNotification.php, CheckoutAccessoryNotification.php, and others.
• Eliminated Checks for Microsoft Teams Channel Notification Setup
  Removed outdated checks for the setup of Microsoft Teams channel notifications from several notification classes. This streamlines the notification system since these checks are no longer needed.

[Godmartinz]

looking at failing tests.

[uberbrady]

Microsoft's should be possessive. Documentation should not be capitalized. When making a URL, the period at the end of the sentence should not be part of the URL.

If the flagged alert-listing at the top is disabled behind "turn off low-inventory alerts", will this still show? If not, then maybe we should change that?

[uberbrady]

Or, if the only way that we show the 'flag' icon when low inventory alerts and we only do that in the layout, could we just change the layout?

[uberbrady]

@snipe worries that the webhook notification might only need to be visible for superadmins, not other people who might see low inventory alerts...

[Godmartinz]

Closing this for now, since Team webhooks wont be deprecated til the end of the year now.