js: Add tests for BurnChecked instruction

[raushan728]

Added a dedicated test suite for the BurnChecked instruction in clients/js
Changes:

• Created clients/js/test/burnChecked.test.ts.
• Success Tests: Verified standard burns with supply check, delegated burns, and zero-amount edge cases.
• Failure Tests: Validated errors for decimal mismatches, insufficient funds, and missing signers.

[raushan728]

@joncinque @timkoopmans The review has been pending for a long time — please take a look once

[joncinque]

Apologies for the slow review, this wasn't very high priority unfortunately, but we do appreciate your contribution.

I'll kick off CI, but I think we just need to remove some of these tests and we can merge it

[joncinque]

Actually, can you rebase your branch? We won't be able to run CI otherwise

[raushan728]

Done @joncinque

• Removed it burns all tokens successfully test
• Removed it burns with different decimal precisions test
• Removed it updates mint supply correctly after burn test and migrated the supply check logic into the first test
• Rebased the branch

[joncinque]

Looks like formatting is failing -- can you run pnpm format:fix from clients/js and commit the result?

[raushan728]

Looks like formatting is failing -- can you run pnpm format:fix from clients/js and commit the result?

done

[joncinque]

Thanks for your contribution!