Revert "Revert "Generate semconv/v1.40.0""

[MrAlias]

Reverts #7978

[Copilot]

Pull request overview

Re-introduces the go.opentelemetry.io/otel/semconv/v1.40.0 package (reverting a prior revert) by adding generated semantic-convention code and updating release notes.

Changes:

• Adds generated v1.40.0 semantic convention packages (including multiple *conv metric helpers).
• Adds core v1.40.0 semconv package files (schema URL, exception consts, docs, error-type helper + tests).
• Updates CHANGELOG.md to announce the new semconv version.

Reviewed changes

Copilot reviewed 25 out of 30 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
semconv/v1.40.0/signalrconv/metric.go	Adds generated SignalR metric instruments and attribute helpers for v1.40.0.
semconv/v1.40.0/schema.go	Declares v1.40.0 SchemaURL constant for the semconv package.
semconv/v1.40.0/rpcconv/metric.go	Adds generated RPC metric instruments and attribute helpers for v1.40.0.
semconv/v1.40.0/processconv/metric.go	Adds generated process metric instruments and attribute helpers for v1.40.0.
semconv/v1.40.0/messagingconv/metric.go	Adds generated messaging metric instruments and attribute helpers for v1.40.0.
semconv/v1.40.0/mcpconv/metric.go	Adds generated MCP metric instruments and attribute helpers for v1.40.0.
semconv/v1.40.0/goconv/metric.go	Adds generated Go runtime metric instruments and attribute helpers for v1.40.0.
semconv/v1.40.0/genaiconv/metric.go	Adds generated GenAI metric instruments and attribute helpers for v1.40.0.
semconv/v1.40.0/faasconv/metric.go	Adds generated FaaS metric instruments and attribute helpers for v1.40.0.
semconv/v1.40.0/exception.go	Adds the exception event name constant in the v1.40.0 semconv package.
semconv/v1.40.0/error_type_test.go	Adds tests validating the new ErrorType helper behavior.
semconv/v1.40.0/error_type.go	Adds an ErrorType(err) helper for producing error.type attributes.
semconv/v1.40.0/doc.go	Adds package-level docs for semconv/v1.40.0.
semconv/v1.40.0/dnsconv/metric.go	Adds generated DNS metric instruments and attribute helpers for v1.40.0.
semconv/v1.40.0/cicdconv/metric.go	Adds generated CI/CD metric instruments and attribute helpers for v1.40.0.
semconv/v1.40.0/azureconv/metric.go	Adds generated Azure metric instruments and attribute helpers for v1.40.0.
semconv/v1.40.0/README.md	Adds a short README for the v1.40.0 semconv package.
semconv/v1.40.0/MIGRATION.md	Adds migration notes for upgrading to semconv v1.40.0.
CHANGELOG.md	Announces addition of the semconv/v1.40.0 package.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.7%. Comparing base (3310435) to head (ff28758).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #7985     +/-   ##
=======================================
- Coverage   81.7%   81.7%   -0.1%     
=======================================
  Files        304     304             
  Lines      23337   23337             
=======================================
- Hits       19081   19080      -1     
- Misses      3867    3868      +1     
  Partials     389     389             

see 3 files with indirect coverage changes

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