fix<codemod-upgrade-legacy>: provide correct path to template files

[LeonMueller-OneAndOnly]

Closes: Fixes an issue for the codemod "upgrade-legacy", where an invalid file path is used

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Following error message is printed to the terminal:

npx @blitzjs/codemod upgrade-legacy
✖ create blitz-server.ts and blitz-client.ts setup files
Error: ENOENT: no such file or directory, open '/Users/admin/.nvm/versions/node/v16.16.0/lib/node_modules/@blitzjs/codemod/node_modules/@blitzjs/generator/dist/templates/app/app/blitz-server.ts'
This is an unexpected error. Please ask for help in the discord #general-help channel. https://discord.blitzjs.com

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I sadly to not have the time currently to get your project up and running in order to submit a fully fleshed out pull-request, like your guidelines suggest to do.
Therefore please view this pull-request as an issue, where i want to provide the suggested solution directly.

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Thank you for your great work on blitzJS, with best regards,
Leon Müller

[changeset-bot]

🦋 Changeset detected

Latest commit: 1f2cce6

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

This PR includes changesets to release 8 packages

Name	Type
@blitzjs/codemod	Patch
@blitzjs/auth	Patch
@blitzjs/next	Patch
@blitzjs/rpc	Patch
@blitzjs/config	Patch
@blitzjs/generator	Patch
next-blitz-auth	Patch
blitz	Patch

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

[siddhsuresh]

Thanks for this PR!

Changes here, looks good to me! WIl do manual testing to see if any other are needed

[LeonMueller-OneAndOnly]

Hello siddhsuresh,

I have force pushed to the forked branch in the meantime, to clean up the git history / bring in further fixes i needed to make it run on my machine (macos).

I was not aware this would influence this pull-request, I hope this does not nullify some work you did on your side. Sorry if that is the case. The 3 things I changed are really straight forward, the reason is included in each commit. I hope this helps.

With best regards,
Leon Müller

[blitzjs-bot]

Added @LeonMueller-OneAndOnly contributions for doc and code