wp-graphql / wp-graphql-woocommerce / 23469175233

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fix: coupon error handling in fillCart and applyCoupon mutations (#984)

* fix: coupon error handling in fillCart and applyCoupon mutations

- Fix validate_coupon() post ID check to only trigger for numeric codes,
  allowing invalid string codes to fall through to WooCommerce's is_valid()
  which returns consistent error messages regardless of casing
- Add fillCart coupon error tests: minimum spend validation and invalid
  coupon code errors are correctly reported in cartErrors
- Add applyCoupon casing test: error messages are consistent across
  lowercase, uppercase, and mixed case invalid coupon codes

* chore: Linter compliances met

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