Release prep for worker packages and Otel extension

[satvu]

Issue describing the changes in this PR

Release prep for worker packages (bump to 2.52.0 with new features for baggage/tag propagation) and for Otel extension (bump to 1.2.0).

Pull request checklist

• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes should not be added to the release notes for the next release
  • Otherwise: I've added my notes to release_notes.md
• My changes do not need to be backported to a previous version
  • Otherwise: Backport tracked by issue/PR #issue_or_pr
• I have added all required tests (Unit tests, E2E tests)

Additional Information

• New features are enabled when used with host runtime 4.1048 and higher, no-op otherwise.

[Copilot]

Pull request overview

Prepares the repo for an upcoming release by bumping the worker package versions to 2.52.0 and the OpenTelemetry extension to 1.2.0, and updating release notes to reflect the new versions and features (baggage/tag propagation).

Changes:

• Bump Microsoft.Azure.Functions.Worker, .Core, and .Grpc minor version from 51 → 52 (release 2.52.0).
• Bump Microsoft.Azure.Functions.Worker.OpenTelemetry minor version from 1 → 2 (release 1.2.0).
• Update release notes to replace <version> placeholders with the released versions.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/DotNetWorker/DotNetWorker.csproj	Bumps worker metapackage version to 2.52.0.
src/DotNetWorker.Core/DotNetWorker.Core.csproj	Bumps core worker version to 2.52.0.
src/DotNetWorker.Grpc/DotNetWorker.Grpc.csproj	Bumps gRPC worker package version to 2.52.0.
src/DotNetWorker.OpenTelemetry/DotNetWorker.OpenTelemetry.csproj	Bumps OpenTelemetry extension package version to 1.2.0.
src/DotNetWorker.OpenTelemetry/release_notes.md	Pins OpenTelemetry extension release notes header to 1.2.0.
release_notes.md	Pins worker package release note headers and dependency bullets to 2.52.0.

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