Reflect in UI that Application Statistics in Admin Area can show approximate data for values more than 10,000

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Problem to solve

Currently, the statistics section in Admin Area > Dashboard > Instance overview uses Get current application statistics API to get the data, and it might show approximate data according to the note from the docs. It is because we use different strategies to calculate values. For values less than 10k we use exact counts, but for values more than 10k we use ReltuplesCountStrategy and TablesampleCountStrategy:

Admin Dashboard (for reference)
Screenshot_2024-02-29_at_09.29.14

Proposal

Add an indication that Statistics shown in the UI might be approximate.

Intended users

Admin users.

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