Installing a Plug-in should not pass the plugin scoped registry as global registry on the NPM install command

[awharn]

Describe the bug

When:

• A user does NOT have a global registry configured
• A user has a scoped registry (i.e npm config set @zowe:registry https://zowe.jfrog.io/artifactory/api/npm/npm-local-release/)
• The user installs a plug-in with that scope (i.e. @zowe/zos-ftp-for-zowe-cli@zowe-v3-lts)

Zowe CLI appends --registry https://zowe.jfrog.io/artifactory/api/npm/npm-local-release/ to the npm install command run behind the scenes. Since that registry might not contain certain packages such as zos-node-accessor@2.0.11, the installation might fail. The scoped registry should not be passed through as a global registry.

https://github.com/zowe/zowe-cli/blob/027d9cc151dd07e5a5a1d236ed47694f68391ee3/packages/imperative/src/imperative/src/plugins/cmd/install/install.handler.ts#L76-L96 https://github.com/zowe/zowe-cli/blob/027d9cc151dd07e5a5a1d236ed47694f68391ee3/packages/imperative/src/imperative/src/plugins/cmd/install/install.handler.ts#L220-L244 https://github.com/zowe/zowe-cli/blob/027d9cc151dd07e5a5a1d236ed47694f68391ee3/packages/imperative/src/imperative/src/plugins/utilities/npm-interface/install.ts#L125 https://github.com/zowe/zowe-cli/blob/027d9cc151dd07e5a5a1d236ed47694f68391ee3/packages/imperative/src/imperative/src/plugins/utilities/NpmFunctions.ts#L60-L62

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