Make shopify-dev-tools self-contained

[durga256]

WHY are these changes introduced?

The copy-only base PR intentionally preserves source-repository paths and generated assets. After the package moves, those pieces must live with shopify-dev-tools so it can build and maintain itself independently in Shopify CLI.

WHAT is this pull request doing?

• Moves the API update script into packages/shopify-dev-tools/scripts.
• Moves the generated agent-skill telemetry hooks into the package source tree.
• Updates the skill generator and its relocation test to use the package-local paths.
• Does not change the CLI workspace or dependency graph; those changes are isolated in the next PR.

How to test your changes?

On the full stack through the workspace-integration PR:

pnpm nx build shopify-dev-tools --skip-nx-cache
pnpm nx test shopify-dev-tools --skip-nx-cache

The package suite passes 27 files / 702 tests.

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; the existing telemetry hooks are preserved
• This is migration plumbing with no user-visible behavior change, 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
• Configure shopify-dev-tools for the CLI workspace #8154
• Make shopify-dev-tools self-contained #8153 👈 (View in Graphite)
• Copy shopify-dev-tools into CLI monorepo #8151
• main

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