feat: add support for tokenless v3

[joseph-sentry]

The idea is that we will detect that if this action is being run from a PR and that PR is from a fork to an upstream repo then we should upload using tokenless, so we will set the TOKENLESS env var so that we can pass the necessary information for the CLI to upload using tokenless

Necessary for: codecov/codecov-cli#434

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.35%. Comparing base (feaf700) to head (9a328fc).

❗ Current head 9a328fc differs from pull request most recent head 6c9378e

Please upload reports for the commit 6c9378e to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1410      +/-   ##
==========================================
- Coverage   91.66%   90.35%   -1.32%     
==========================================
  Files           4        4              
  Lines         312      311       -1     
  Branches       85       84       -1     
==========================================
- Hits          286      281       -5     
- Misses         26       30       +4     

Flag	Coverage Δ
demo	90.35% <100.00%> (-1.32%)	⬇️
macos-latest	90.35% <100.00%> (-1.32%)	⬇️
macos-latest-xlarge	90.35% <100.00%> (?)
script	90.35% <100.00%> (-1.32%)	⬇️
ubuntu-latest	90.35% <100.00%> (-1.32%)	⬇️
version	?
windows-latest	90.35% <100.00%> (-1.32%)	⬇️

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[thomasrockhu-codecov]

good catch

[thomasrockhu-codecov]

can you in this PR description link to the CLI change that is consuming this?

[thomasrockhu-codecov]

Just need some documentation to how this will be consumed

[thomasrockhu-codecov]

@joseph-sentry you will need to run npm run build locally I think. Or the install script should handle it when you commit