[Instrumentation.AspNetCore] Fix span names when http.request.method is reporter as _OTHER

[Kielek]

Fixes #5461
Design discussion issue #

Changes

• Fixed an issue for span names when http.request.method is reporter as _OTHER.
  Now, span names starts with HTTP, previously it was started by _OTHER.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• [ ] Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.14%. Comparing base (6250307) to head (44705c2).
Report is 152 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    open-telemetry/opentelemetry-dotnet#5484      +/-   ##
==========================================
+ Coverage   83.38%   85.14%   +1.75%     
==========================================
  Files         297      290       -7     
  Lines       12531    12588      +57     
==========================================
+ Hits        10449    10718     +269     
+ Misses       2082     1870     -212     

Flag	Coverage Δ
unittests	?
unittests-Instrumentation-Experimental	24.15% <100.00%> (?)
unittests-Instrumentation-Stable	24.17% <100.00%> (?)
unittests-Solution-Experimental	85.56% <100.00%> (?)
unittests-Solution-Stable	85.58% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...tation.AspNetCore/Implementation/HttpInListener.cs	89.79% <100.00%> (+0.21%)	⬆️
...tp/Implementation/HttpHandlerDiagnosticListener.cs	70.63% <100.00%> (-0.24%)	⬇️
...plementation/HttpWebRequestActivitySource.netfx.cs	80.12% <100.00%> (-0.66%)	⬇️

... and 74 files with indirect coverage changes