chore(middleware-sdk-transcribe-streaming): remove unused yarn build before test

[trivikr]

Issue

Refs: #3248

Description

Removes unused yarn build before test, as it's no longer required.
We use ts-jest to run jest tests without compiling them to TypeScript.

Testing

Verified that yarn test succeeds without building middleware-sdk-transcribe-streaming package:

$ yarn test
yarn run v1.22.17
$ jest --passWithNoTests
 PASS  src/middleware-endpoint.spec.ts
 PASS  src/signer.spec.ts
 PASS  src/websocket-handler.spec.ts

Test Suites: 3 passed, 3 total
Tests:       15 passed, 15 total
Snapshots:   0 total
Time:        4.395 s
Ran all test suites.
Done in 5.46s.

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