CI: Remove mcp and addon-mcp from verdaccio proxy

[huang-julien]

Closes #

What I did

https://app.circleci.com/pipelines/github/storybookjs/storybook/128916/workflows/8d89e13b-5b14-47ca-8dab-16b0afc6545d/jobs/1838051

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

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Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli-storybook/src/sandbox-templates.ts

• Declare whether manual QA will be needed for this PR during the next release, through qa:needed or qa:skip

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
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  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook publish.yml --field pr=<PR_NUMBER>

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 018b468f-be6a-42d5-b8c8-ef2020414297

📥 Commits

Reviewing files that changed from the base of the PR and between 8b97ea5 and 885fd01.

📒 Files selected for processing (1)

• scripts/verdaccio.yaml

💤 Files with no reviewable changes (1)

• scripts/verdaccio.yaml

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Walkthrough

Removed the Verdaccio package proxy entries for @storybook/addon-mcp and @storybook/mcp.

Changes

Cohort / File(s)	Summary
MCP proxy cleanup scripts/verdaccio.yaml	Removes Verdaccio proxy entries for the two Storybook MCP packages.

Possibly related PRs

• storybookjs/storybook#35683: Modifies Storybook MCP and CSF plugin packaging and proxy configuration.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

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