Release v2 with ESRP

[Elizabeth Craig (ecraig12345)]

Update .ado/release.yml to use the current ESRP approach and delete the old release pipeline.

In this branch, it makes more sense to use the official EsrpRelease task, since there's only one package. However, the publish operations are done with beachball v3 based on a version installed under packages/beachball-v3, due to its better auth support. (The PR pipeline now runs beachball:v3 check for validation.)

To avoid security alerts on verdaccio's outdated tree of deps, verdaccio and all other deps specific to the mock Registry and the packagePublish tests that use it have been removed, and the relevant tests have been disabled.

[Copilot]

Pull request overview

Modernizes v2 releases to use ESRP while running publish operations through pinned Beachball v3 tooling.

Changes:

• Replaces legacy release pipelines with staged ESRP build, publish, and push jobs.
• Adds Beachball v3 and npm authentication tooling.
• Removes Verdaccio dependencies and disables affected integration tests.

Reviewed changes

Copilot reviewed 19 out of 20 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.ado/publish.yml	Removes the legacy prepublish pipeline.
.ado/release.yml	Implements the ESRP release pipeline.
.ado/templates/readonly-variables.yml	Adds reusable read-only variable declarations.
.ado/templates/setup.yml	Adds shared authenticated pipeline setup.
.github/workflows/pr.yml	Adds Node 22 and v3 validation.
.github/workflows/release.yml	Removes the GitHub release workflow.
.vscode/settings.json	Updates editor settings.
.yarn/plugins/@yarnpkg/plugin-engines.cjs	Updates the engines plugin.
.yarn/plugins/@yarnpkg/plugin-npmrc.cjs	Adds npmrc authentication support.
.yarnrc.yml	Configures updated Yarn plugins.
beachball.config.js	Makes configuration compatible with v3.
change/beachball-e494bbac-87bd-4788-8b3b-982bbee39495.json	Records the release setup change.
package.json	Adds v3 command wrappers.
packages/beachball-v3/package.json	Adds the pinned v3 workspace.
packages/beachball/package.json	Removes obsolete registry dependencies.
packages/beachball/src/__functional__/packageManager/getNpmPackageInfo.test.ts	Uses the configured release registry.
packages/beachball/src/__functional__/packageManager/packagePublish.test.ts	Disables Verdaccio-backed tests.
packages/beachball/src/__fixtures__/registry.ts	Suppresses checks for the disabled fixture.
packages/beachball/src/env.ts	Removes legacy release-pipeline detection.
yarn.lock	Updates the resolved dependency graph.

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