fix: remove incorrect tooltip on remaining credit balance (#7383)

## Summary
Removed incorrect tooltip displayed on the remaining credit balance in
the subscription panel.

## Changes
- **What**: Removed unused `refreshTooltip` destructure and i18n
translation key
- **Breaking**: None

Fixes #6694

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7383-fix-remove-incorrect-tooltip-on-remaining-credit-balance-2c66d73d3650814eaee0f3c9006b7bd6)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude <noreply@anthropic.com>

tests-ui/tests/platform/cloud/subscription/components/SubscriptionPanel.test.ts

@@ -42,7 +42,6 @@ const mockCreditsData = {
 
 const mockActionsData = {
   isLoadingSupport: false,
-  refreshTooltip: 'Refreshes on 2024-12-31',
   handleAddApiCredits: vi.fn(),
   handleMessageSupport: vi.fn(),
   handleRefresh: vi.fn(),