Use a different set of commands to detect fourslash test updates

[jakebailey]

This is the weird set of commands I have been using locally to keep things up to date while working around the problem of "failing tests" leaving baselines behind. It seems like updatefailing should do something like this, but I think it might be too annoying.

(Sending first without the baseline update to show that it works.)

[Copilot]

Pull Request Overview

This PR updates the CI workflow to use a more comprehensive process for detecting and updating fourslash test changes. The new approach addresses an issue where failing tests leave behind baselines, which the existing updatefailing command doesn't properly handle.

• Replaces single updatefailing command with a multi-step process
• Clears failing test list, regenerates fourslash tests, and iteratively updates baselines
• Ensures all test state is properly synchronized by removing and regenerating fourslash baselines

[Copilot]

This complex multi-step process lacks inline comments explaining why each step is necessary. Add comments documenting the purpose of each phase (e.g., why tests are run multiple times, why fourslash baselines are removed and regenerated) to help maintainers understand this workaround.

Suggested change

	run: |
	echo "" > ./internal/fourslash/_scripts/failingTests.txt
	npm run convertfourslash
	npx hereby test
	npx hereby baseline-accept
	npm run updatefailing
	npx hereby baseline-accept
	rm -rf testdata/baselines/reference/fourslash
	npx hereby test
	run: |
	# Clear the list of failing fourslash tests to start fresh.
	echo "" > ./internal/fourslash/_scripts/failingTests.txt
	# Convert fourslash test sources to the latest format.
	npm run convertfourslash
	# Run all tests to generate new baselines.
	npx hereby test
	# Accept all generated baselines to update reference outputs.
	npx hereby baseline-accept
	# Update the list of failing tests after baseline update.
	npm run updatefailing
	# Accept any new baselines generated by updatefailing.
	npx hereby baseline-accept
	# Remove existing fourslash baselines to force full regeneration.
	rm -rf testdata/baselines/reference/fourslash
	# Run tests again to regenerate all fourslash baselines from scratch.
	npx hereby test
	# Accept the freshly regenerated baselines.