Add total filtered Generations to UI

[PhiBrandon]

Describe the feature or potential improvement

When filtering large sets of generations, often you're left with having to set the row count to 10 then counting how many generations are on the last page.

Idea to add the total amount of generations to the UI on the generations page.

For reference:
https://github.com/langfuse/langfuse/blob/main/web/src/components/table/use-cases/generations.tsx

Line 117: Total count for returned query is being returned. Need to add it to the UI.

Additional information

No response