fix(typescript): include @temporalio/proto for harness

[chris-olszewski]

What was changed

Include @temporalio/proto when generating the TS program from the template.

Why?

Fix tsc build errors from missing types that now happens e.g.

Got too eager in #789 and didn't do a proper clean of my features checkout. This resulted in me having @temporalio/proto in my node_modules from some previous work and it was able to resolve when I ran the tests locally.

Checklist

1. Closes

2. How was this tested:
   Running test locally, but run git clean -fdx in features to make sure you don't have junk in node_modules that hides errors.

# Before
$ git clean -fdx
$  go run . run --lang ts --version ../typescript
...
../features/schedule/cron/feature.ts:3:26 - error TS2307: Cannot find module '@temporalio/proto' or its corresponding type declarations.

3 import { temporal } from '@temporalio/proto';
                           ~~~~~~~~~~~~~~~~~~~

../harness/ts/harness.ts:14:24 - error TS2307: Cannot find module '@temporalio/proto' or its corresponding type declarations.

14 import * as proto from '@temporalio/proto';
                          ~~~~~~~~~~~~~~~~~~~


Found 8 errors.
# With changes
$  go run . run --lang ts --version ../typescript
...
Executing feature update/deduplication
Checking result on feature update/deduplication
Using custom result checker

3. Any docs updates needed?

[THardy98]

Huh, this must've been removed at some point, proto used to be part of this list