Test shopify-dev-tools separately in CI

[durga256]

WHY are these changes introduced?

Shopify CLI's root Vitest configuration selects the existing CLI test projects explicitly, so adding shopify-dev-tools to Nx does not automatically run its 702 tests in CI.

WHAT is this pull request doing?

Runs the package's Nx test target separately in:

• PR CI, once on the default Node version and Ubuntu
• Main CI, once on the default Node version and Ubuntu
• Manually triggered test workflows

This preserves the existing cross-platform CLI test matrix without multiplying the package suite across every matrix entry.

How to test your changes?

pnpm nx test shopify-dev-tools --skip-nx-cache --output-style=stream

The package suite passes 27 files / 702 tests. All three edited workflow files parse as valid YAML.

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes; none are required
• I've considered analytics changes; none are required
• This changes test coverage only, so no CLI changeset is required

[durga256]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Bundle shopify-dev-tools with Shopify CLI #8157
• Remove Verdict and experimentation support from shopify-dev-tools #8156
• Publish shopify-dev-tools to Cloudsmith #8152
• Test shopify-dev-tools separately in CI #8155 👈 (View in Graphite)
• Configure shopify-dev-tools for the CLI workspace #8154
• Make shopify-dev-tools self-contained #8153
• Copy shopify-dev-tools into CLI monorepo #8151
• main

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