fix(instrumentation-http): set conditionally required error.type attribute

[mwear]

Which problem is this PR solving?

instrumentation-http sets a span's status to Error from the response status code but never sets error.type on that span. Semconv marks error.type as Conditionally Required "If request has ended with an error", and asks for the status code as a string once a response was received. This PR adds it.

This was an issue identified by the semantic conventions conformance repo.

Fixes #7059

Short description of the changes

• Add parseErrorType in utils.ts. It returns the status code as a string when the code is an error for that span kind, undefined otherwise.
• Set the attribute at both points where the span status is derived from a response code, client and server.
• Route both metric helpers through the same function. This is a refactor with no behavior change: each previously inlined the identical threshold check.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• units, manual testing

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.00%. Comparing base (7b155b8) to head (f13e573).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7061   +/-   ##
=======================================
  Coverage   95.00%   95.00%           
=======================================
  Files         407      407           
  Lines       14342    14353   +11     
  Branches     3289     3290    +1     
=======================================
+ Hits        13625    13636   +11     
  Misses        717      717           

Files with missing lines	Coverage Δ
...ges/opentelemetry-instrumentation-http/src/http.ts	93.64% <100.00%> (+0.11%)	⬆️
...es/opentelemetry-instrumentation-http/src/utils.ts	88.67% <100.00%> (+0.15%)	⬆️

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