chore(pricing): Pricing retrieval improvements (#12128)

**What**
I have removed the check for the context key where it was fetching all attributes available and then stripping out the one that does not exists.. On big dataset these would remove multiple hundreds of ms of query execution

.changeset/breezy-ligers-look.md

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+"@medusajs/pricing": patch
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+chore(pricing): Pricing retrieval improvements