Fix long webhook URL overflow for custom integration

What does this MR do?

Apply word-break rule to .content-list > li element to prevent long text string overflowing.

Screenshots

Before:

After:

What are the relevant issue numbers?

#41040 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides

Closes #41040 (closed)