tests: Update showcase test to include service name in resource extraction #12665

Commit message did not follow Conventional Commits

Some of your commit messages failed linting.

Visit conventionalcommits.org to learn our conventions.

Run git commit --amend and edit your message to match Conventional Commit guidelines.

❌ The following linting errors found:

subject may not be empty
type may not be empty
for the following input:
"stabilize otel integration tests and fix service name propagation for identityclient"