[DEVPLAT-6347] Upgrade dd-trace-go to v2

[Neurostep]

Description

A few months ago DataDog team announced a new major release v2 of the dd-trace-go. It contains many API improvements, but most importantly, they stopped supporting v1.

In this PR we are upgrading the dd-trace-go library to v2. Since some APIs have changed, the PR contains changes to reflect that.

For downstream services, most notable change is that tracer.Start returns an error. This will be propagated using parity workflow.

Testing considerations

• Deploy to development/staging of go-chassis and check if all is working as before

Checklist

• Prefixed the PR title with the JIRA ticket code
• Performed simple, atomic commits with good commit messages
• Verified that the commit history is linear and commits are squashed as necessary
• Thoroughly tested the changes in development and/or staging
• Updated the README.md as necessary

Related links

• https://www.datadoghq.com/blog/go-tracer-v2
• https://github.com/DataDog/dd-trace-go/blob/b1c85e202bc9911945fa6097d676b47d825aca71/MIGRATING.md
• DEVPLAT-6347

---

Note

Upgrades dd-trace-go to v2 and updates all instrumentation, tracer APIs, and tests (service option rename, Start returns error, span/trace ID types), plus dependency bumps.

• Tracing/Instrumentation (v2 migration):
  • Replace all gopkg.in/DataDog/dd-trace-go.v1 imports with github.com/DataDog/dd-trace-go/v2 and contrib .../v2 packages.
  • Rename options: WithServiceName(...) -> WithService(...); SQL/GORM registration updated accordingly.
  • tracer.Start now returns error; Tracer.Start() updated to return error.
  • Span types updated to *tracer.Span; Kafka helpers and carriers adjusted; trace context propagation preserved.
  • Logging: LogContext.TraceID changed from uint64 to string (v2 API).
• Integrations:
  • AWS SDK v2, gRPC, Gorilla Mux, net/http, Redis, GORM, and SQL tracing moved to v2 contrib packages and APIs.
• Tests:
  • Updated to use v2 mocktracer, ext, and new types/option names.
• Dependencies:
  • go.mod/go.sum updated: add dd-trace-go v2 and contrib v2 modules; bump multiple DataDog/OTel and related indirect deps; remove v1 packages.

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[terranisu]

Looks upgraded to me 🚀