feat: add enrollments/availabilities counter to event show page

[ruilopesm]

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[reviewpad]

AI-Generated Summary: This pull request introduces changes to the event page and Availability component in the application. It removes the buttonTitle property from the Availability component and consequently from the function calls in the event pages. Instead, it adds a counter to the title within both the Availability component and the event pages, which shows the number of mentors or enrolled ninjas depending on the context. In addition, it modifies the Availability function signature by removing the buttonTitle parameter. Overall, the pull request simplifies the code and enhances user interface by providing a count of mentors or enrolled ninjas.

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