fix: Fix cucumber transaction builder reliability (#3147)

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## Description
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We sometimes find that transactions created by the cucumber transaction builder fail lmdb insertion by duplicate excess. 
This increases the private key range for the private keys increasing the range of the excess. This should decrease duplicate entries. 

## Motivation and Context
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## How Has This Been Tested?
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## Checklist:
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* [x] I'm merging against the `development` branch.
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integration_tests/helpers/transactionBuilder.js

@@ -169,7 +169,7 @@ class TransactionBuilder {
     };
     let key = Math.floor(Math.random() * 500 + 1);
     let privateKey = Buffer.from(toLittleEndian(key, 256)).toString("hex");
-    let scriptKey = Math.floor(Math.random() * 500 + 1);
+    let scriptKey = Math.floor(Math.random() * 500000000000 + 1);
     let scriptPrivateKey = Buffer.from(toLittleEndian(scriptKey, 256)).toString(
       "hex"
     );
@@ -339,7 +339,9 @@ class TransactionBuilder {
       flags: 1,
       maturity: lockHeight,
     };
-    let scriptOffsetPrivateKeyNum = Math.floor(Math.random() * 500 + 1);
+    let scriptOffsetPrivateKeyNum = Math.floor(
+      Math.random() * 500000000000 + 1
+    );
     let scriptOffsetPrivateKey = Buffer.from(
       toLittleEndian(scriptOffsetPrivateKeyNum, 256)
     ).toString("hex");