test: jestify refund-endpoint test

Migrated test from Tap to Jest.

File Path:
packages/cactus-test-plugin-htlc-eth-besu/
src/test/typescript/integration/
plugin-htlc-eth-besu/refund-endpoint.test.ts

This is a PARTIAL resolution to issue #238

Signed-off-by: awadhana <[email protected]>

Author: awadhana

.taprc

@@ -128,7 +128,6 @@ files:
   - ./packages/cactus-test-plugin-htlc-eth-besu/src/test/typescript/integration/plugin-htlc-eth-besu/get-single-status-endpoint.test.ts
   - ./packages/cactus-test-plugin-htlc-eth-besu/src/test/typescript/integration/plugin-htlc-eth-besu/withdraw-endpoint-invalid.test.ts
   - ./packages/cactus-test-plugin-htlc-eth-besu/src/test/typescript/integration/plugin-htlc-eth-besu/openapi/openapi-validation.test.ts
-  - ./packages/cactus-test-plugin-htlc-eth-besu/src/test/typescript/integration/plugin-htlc-eth-besu/refund-endpoint.test.ts
   - ./packages/cactus-cmd-api-server/src/test/typescript/benchmark/artillery-api-benchmark.test.ts
   - ./packages/cactus-cmd-api-server/src/test/typescript/integration/jwt-socketio-endpoint-authorization.test.ts
   - ./packages/cactus-cmd-api-server/src/test/typescript/integration/jwt-endpoint-authz-scope-enforcement.test.ts