Add `prism/Helpers.cc` and `prism/Helpers.h` #6121

	name: CI

	on:
	[push, pull_request]

	# Runs Prism specific tests in a Github Action workflow only on Shopify's fork
	# This is useful during Prism migration as it contains extra tests.
	# It'll be removed once the migration is complete.
	jobs:
	tests:
	runs-on: ubuntu-latest
	name: Prism Parser Regression Tests
	if: github.repository == 'Shopify/sorbet'
	steps:
	- uses: actions/checkout@v4
	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: 3.3.0
	- name: Set up Bazel
	uses: bazel-contrib/[email protected]
	with:
	# Avoid downloading Bazel every time.
	bazelisk-cache: true
	# Store build cache per workflow.
	disk-cache: ${{ github.workflow }}
	# Share repository cache between workflows.
	repository-cache: true
	- name: Verify parse trees
	run: ./tools/scripts/verify_prism_regression_tests.sh
	- name: Run tests
	run: ./bazel test //test:prism_regression --config=dbg --test_output=errors
	- name: Run location tests
	run: ./bazel test //test:prism_location_tests --config=dbg --test_output=errors
	- name: Run corpus tests
	run: ./bazel test //test:test_corpus_prism --config=dbg --test_output=errors

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