feat: add e2e tests for stencil

[nmerget]

Description

Please provide the following information:

Add e2e-stencil to test if Stencil framework works with generated stencil outputs.

Blocked until #1547 is merged.

Make sure to follow the PR preparation steps in CONTRIBUTING.md before submitting your PR:

• format the codebase: from the root, run yarn fmt:prettier.
• update all snapshots (in core & CLI): from the root, run yarn test:update
• add Changeset entry: from the root, run yarn g:changeset and follow the CLI instructions. Alternatively, use the Changeset Github Bot to create the file.

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Latest commit: 2f9e673

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