Add act evals on `stagehand.page`

[kamath]

why

#326 moved act from stagehand to stagehand.page and deprecated stagehand.act. This changes evals to account for this change.

what changed

Evals now point to stagehand.page.act instead of stagehand.act

test plan

evals

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: f6e165d4ed7c3726d688b614c497629dde93502b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

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

[kamath]

act evals passed, merging