Fix unit test runs

[jviau]

Issue describing the changes in this PR

resolves #issue_for_this_pr

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

This PR fixes the unit test CI job to correctly run tests.

[Copilot]

Pull request overview

This PR consolidates multiple DotNetCoreCLI@2 test tasks into a single unified task and updates test project names to match the actual csproj files in the repository.

Changes:

• Consolidated four separate DotNetCoreCLI@2 tasks (Worker Tests, OpenTelemetry Tests, Sdk Tests, Extension Tests) into a single "Run Tests" task
• Updated test project name from DotNetWorkerTests.csproj to DotNetWorker.Tests.csproj
• Added DotNetWorker.ApplicationInsights.Tests.csproj to the test projects list

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