fix: Release packaging

[bitsandfoxes]

New pack script:

1. Copy package-dev but exclude aliasing, tests, asmdef,...
2. Copy missing .meta files and files we want to override from package
3. Copy Changelog, Licence and Samples
4. zip it - ship it

#skip-changelog

[bruno-garcia]

I ran it locally (after dotnet build) and I'm getting:

Copy-Item: /Users/bruno/git/sentry-unity/scripts/pack.ps1:25:1
Line |
  25 |  Copy-Item "samples/unity-of-bugs/Assets/Scripts" -Destination "packag …
     |  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     | Cannot find path '/Users/bruno/git/sentry-unity/scripts/samples/unity-of-bugs/Assets/Scripts' because it does not exist.

[bruno-garcia]

my bad, the script assumes running from root, I ran it from /scripts