Fix folder name for package publish workflow

[utpilla]

The current workflow to publish packages is failing because it uses the full name of the tag/branch for the folder name. The full name contains a forward slash which is not allowed.

• https://github.com/open-telemetry/opentelemetry-dotnet/actions/runs/3155519159/jobs/5134267776
• https://github.com/open-telemetry/opentelemetry-dotnet/actions/runs/3155539642

Changes

• Use github.ref_name to get just the name of the tag/branch

[codecov]

Codecov Report

Merging #3713 (62033ce) into main (c40effd) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3713   +/-   ##
=======================================
  Coverage   87.31%   87.31%           
=======================================
  Files         274      274           
  Lines       10009    10009           
=======================================
  Hits         8739     8739           
  Misses       1270     1270           

Impacted Files	Coverage Δ
...tpListener/Internal/PrometheusCollectionManager.cs	72.52% <0.00%> (-2.20%)	⬇️
...Telemetry/Internal/SelfDiagnosticsEventListener.cs	96.87% <0.00%> (-0.79%)	⬇️
...emetry.Api/Internal/OpenTelemetryApiEventSource.cs	82.35% <0.00%> (+8.82%)	⬆️