Use local package instead of installed package

[GarthDB]

Description

Previously, the tests used whatever pnpm tdiff would use, including the globally installed package.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[changeset-bot]

🦋 Changeset detected

Latest commit: bc869eb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@adobe/token-diff-generator	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[GarthDB]

Run report for bc869eb1

Total time: 14.4s | Comparison time: 15.5s | Estimated savings: 1.1s (6.8% faster)

	Action	Time	Status	Info
🟩	SyncWorkspace	5.3ms	Passed
⬛️	SetupToolchain(node:~20.12)	2s	Skipped
🟩	SyncProject(node, diff)	0.2ms	Passed
🟩	SyncProject(node, root)	0.2ms	Passed
🟩	InstallWorkspaceDeps(node:~20.12)	7.1s	Passed
🟩	RunTask(diff:diff)	107.6ms	Passed
🟩	RunTask(root:test)	2.1s	Passed
🟩	RunTask(diff:test)	5.4s	Passed

Touched files

.changeset/eleven-cougars-guess.md
package.json
pnpm-lock.yaml
tools/diff-generator/src/lib/cli.js
tools/diff-generator/test/cli.test.js
tools/diff-generator/test/fileImport.test.js