Remove unused GraphQL operations

[lkostrowski]

Remove operations with no usages across the codebase:

• GiftCardProductsCount query (giftCards)
• GridWarehouses query (products)
• BulkDeleteShippingRate mutation (shipping)
• UserPassowrdChange mutation (staff)
• SetRefundReasonType + ClearRefundReasonType mutations (refundsSettings, deleting the now-empty mutations.ts)

Regenerated GraphQL types/hooks accordingly.

Scope of the change

• I confirm I added ripples for changes (see src/ripples) or my feature doesn't contain any user-facing changes
• I used analytics "trackEvent" for important events

[changeset-bot]

⚠️ No Changeset found

Latest commit: f9ee62e

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.59%. Comparing base (425dc70) to head (8aeac15).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #6687    +/-   ##
========================================
  Coverage   51.58%   51.59%            
========================================
  Files        2835     2835            
  Lines       51003    51003            
  Branches    12072    12072            
========================================
+ Hits        26311    26316     +5     
- Misses      23386    24282   +896     
+ Partials     1306      405   -901     

Flag	Coverage Δ
storybook	49.27% <ø> (+0.03%)	⬆️
units	46.46% <ø> (ø)

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