Fix(admin-ui, medusa): stock location fixes (#3395)

**What**
- A series of minor fixes for admin-ui relating to managing stock locations: 
  - make "create location" `primary`
  - add delete prompt when cancelling creation if information has been input
  - avoid clipping focus border on country select when creating a stock location
  - allow removals of sales channels from stock locations 

Fixes CORE-1191, CORE-1192, CORE-1190, CORE-1189

.changeset/rich-flowers-decide.md

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+---
+"@medusajs/admin-ui": patch
+"@medusajs/medusa": patch
+---
+
+fix(admin-ui, medusa): Minor ui fixes relating to stock locations