Add user-agent policy to fine-tuning extension HTTP clients for request tracing

[saanikaguptamicrosoft]

Notes

• Added azd-ext-azure-ai-finetune/<version> user-agent to all outgoing API calls (OpenAI + ARM)
• Extracted internal/version package (previously version vars lived in internal/cmd), and accordingly updated ldflags paths in build scripts.
• To resolve transitive dependency of armappservice/v2, ran-
  • go get github.com/azure/azure-dev/cli/azd/pkg/azsdk
  • go mod tidy

Testing

• azd x build — builds successfully
• All UTs pass

[Copilot]

Pull request overview

This PR introduces build-time version metadata for the azure.ai.finetune extension and uses it to set a custom User-Agent on outbound HTTP calls (OpenAI + ARM), alongside required dependency and build-script updates.

Changes:

• Added internal/version package to hold build-injected Version/Commit/BuildDate, and updated the version command + build scripts to use it.
• Added an azsdk.NewUserAgentPolicy(...) to Azure SDK pipelines used by the OpenAI middleware and ARM client factory.
• Updated go.mod/go.sum to newer Azure SDK / azd / related transitive dependencies (notably azcore to support azcore/arm).

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
cli/azd/extensions/azure.ai.finetune/internal/version/version.go	New package for build-time version metadata variables.
cli/azd/extensions/azure.ai.finetune/internal/providers/factory/provider_factory.go	Builds a User-Agent string from version info and injects it into Azure SDK pipelines / ARM client options.
cli/azd/extensions/azure.ai.finetune/internal/cmd/version.go	Switches version command output to read from internal/version.
cli/azd/extensions/azure.ai.finetune/go.mod	Bumps dependencies to support new imports/policies.
cli/azd/extensions/azure.ai.finetune/go.sum	Updated dependency checksums for the bumped modules.
cli/azd/extensions/azure.ai.finetune/ci-build.ps1	Updates ldflags to inject version metadata into internal/version.
cli/azd/extensions/azure.ai.finetune/build.sh	Updates ldflags injection target package path to internal/version.
cli/azd/extensions/azure.ai.finetune/build.ps1	Updates ldflags injection target package path to internal/version.

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