Show total sessions and users for each release

[sentry-junior]

The Releases page should permanently display both total sessions and total users for every release. Each value should have its own row so the metrics are immediately visible and scannable.

Current behavior

Total sessions and users are only available by hovering over the Adoption histogram, making them difficult to compare across releases.

Desired behavior

• Display total sessions and total users as separate rows for each release.
• Keep both metrics visible regardless of the selected display mode.
• Use totals from the currently selected stats period.

Requested by Michael Chai via Junior.

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View Junior Session in Sentry

[linear-code]

ENG-8298

[getsantry]

Routing to @getsentry/product-owners-releases for triage ⏲️