[TRI-699] using pathToFileURL on path used in detectPagesOrAppDir

[dylanrod21]

fixes #190
/claim #190

Changes Made

1. I followed the instructions to setup trigger.dev in my local NextJS app pointing to my local trigger.dev fork and reproduced the error.
2. I traced the code and found the location of the path causing the issue.
3. I added url from npm to use pathToFileURL to convert the path to one that would be valid on windows.

Testing

1. I spun up the trigger.dev app locally
2. I created a new NextJS app locally
3. I ran the init command in the cli from my updated code for the cli in my local Next app and confirmed that the installation no longer aborted due to path issues

[changeset-bot]

🦋 Changeset detected

Latest commit: 2f1b2a3

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

This PR includes changesets to release 1 package

Name	Type
@trigger.dev/cli	Patch

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[ericallam]

This looks great! About to test to make sure it still works on macOS but in the meantime could you add a changeset to this PR by running this in the root:

pnpm run changeset:add

Then follow the prompts to select a "patch" bump, like so:

CleanShot.2023-07-20.at.09.23.14.mp4