feat: disallow installing root plugin

[mdonnalley]

• Remove root plugin from human readable output in plugins --core (still present in json)
• Disallow installing root plugin. It will error if it's the only plugin provided, otherwise it will warn
• Suggest that the user use update if the CLI is installable and plugin-update is installed

@W-14481853@

[WillieRuemmele]

should we add a UT to cover these errors?

[WillieRuemmele]

QA Notes

---

built and linked this branch into my cli install at /Users/william.ruemmele/.nvm/versions/node/v20.12.2/lib/node_modules/@salesforce/cli

✅ :
before

@oclif/plugin-which 3.2.2 (core)
@salesforce/cli 2.46.4 (core)
apex 3.1.18 (core)

after

@oclif/plugin-which 3.2.2 (core)
apex 3.1.18 (core)

✅ : still present in --json

    "options": {
      "isRoot": true,
      "root": "/Users/william.ruemmele/.nvm/versions/node/v20.12.2/lib/node_modules/@salesforce/cli/dist"
    },
    "alias": "@salesforce/cli",

✅ : --json output matches
✅ : error on sf plugin install @salesforce/cli / warn on multiple plugin+root

➜  dreamhouse-lwc git:(main) ✗  hub:(GLOBAL - DevHub) scratch:([email protected])
 ➜  sf plugins install @salesforce/cli                         
 ›   Warning: Plugin @oclif/plugin-plugins (5.2.3) differs from the version specified by sf (5.2.4)
 ›   Error: Ignoring root plugin @salesforce/cli.
➜  dreamhouse-lwc git:(main) ✗  hub:(GLOBAL - DevHub) scratch:([email protected])
 ➜  sf plugins install @salesforce/cli @salesforce/plugin-source
 ›   Warning: Plugin @oclif/plugin-plugins (5.2.3) differs from the version specified by sf (5.2.4)
 ›   Warning: Ignoring root plugin @salesforce/cli.
Polling for new version(s) to become available on npm... done

✅ : error when using an installer CLI about installing @salesforce/cli

➜  dreamhouse-lwc git:(main) ✗  hub:(GLOBAL - DevHub) scratch:([email protected])
 ➜  sf plugins install @salesforce/cli
 ›   Error: Ignoring root plugin @salesforce/cli. Use "sf update" to update @salesforce/cli.

✅ : warning when installer installing @salesforce/cli + another plugin

 ➜  sf plugins install @salesforce/cli @salesforce/plugin-source
 ›   Warning: Ignoring root plugin @salesforce/cli. Use "sf update" to update @salesforce/cli.
Polling for new version(s) to become available on npm... done