chore: remove deprecated bankrun and related stuff

- Delete @solana-developers/helpers and related references from package.json and pnpm-lock.yaml.
- Remove favorites-bankrun.test.ts and system-errors.ts files as they are no longer needed.
- Clean up the project structure by eliminating obsolete code and dependencies.

Author: sol-warrior

basics/favorites/anchor/package.json

@@ -6,7 +6,6 @@
 	},
 	"dependencies": {
 		"@coral-xyz/anchor": "0.32.1",
-		"@solana-developers/helpers": "^2.0.0",
 		"@solana/web3.js": "^1.98.4",
 		"litesvm": "^0.4.0"
 	},
@@ -15,11 +14,9 @@
 		"@types/bn.js": "^5.1.0",
 		"@types/chai": "^4.3.0",
 		"@types/mocha": "^9.0.0",
-		"anchor-bankrun": "^0.4.0",
 		"chai": "^4.3.4",
 		"mocha": "^9.0.3",
 		"prettier": "^2.6.2",
-		"solana-bankrun": "^0.3.0",
 		"ts-mocha": "^10.0.0",
 		"typescript": "^4.3.5"
 	}