Use include-install-pnpm.yml in build-performance-observability.yml

[CraigMacomber]

Description

Use include-install-pnpm.yml in build-performance-observability.yml to deduplicate pnpm setup logic and gain caching.

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[Copilot]

Pull request overview

This PR updates the build performance observability pipeline to use the shared pnpm installation template, reducing duplicated setup logic and enabling pnpm store caching.

Changes:

• Replaces inline npm registry authentication and pnpm installation/configuration steps with include-install-pnpm.yml.
• Passes the checked-out Fluid Framework directory as the template build directory.

[Abe27342]

this log (outputing registry value to pipeline for information purposes) got removed from pipeline logs in the sample run you provided. IMO we should keep it around; which registry we're using is an occasionally helpful diagnostic.

[Abe27342]

Change LGTM otherwise though. Ping if you need approval after addressing.