fix(@opentelemetry/instrumentation-winston): Removing error details when @opentelemetry/winston-transport is not available

[hectorhdzg]

Which problem is this PR solving?

Fixes #2244

Short description of the changes

Removed error details in diag.warn call

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.30%. Comparing base (dfb2dff) to head (5305e0b).
Report is 178 commits behind head on main.

❗ Current head 5305e0b differs from pull request most recent head 7d281e0

Please upload reports for the commit 7d281e0 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2301      +/-   ##
==========================================
- Coverage   90.97%   90.30%   -0.68%     
==========================================
  Files         146      147       +1     
  Lines        7492     7263     -229     
  Branches     1502     1509       +7     
==========================================
- Hits         6816     6559     -257     
- Misses        676      704      +28     

Files	Coverage Δ
...try-instrumentation-winston/src/instrumentation.ts	67.80% <ø> (+10.19%)	⬆️

... and 58 files with indirect coverage changes

[pichlermarc]

Thanks 👍