add SwitchOrg helper for org re-authentication

[asherMuneer97]

Adds a URL builder that redirects users into a target organization with prompt=login so the new org context is applied after callback.

Explain your changes

Adds a SwitchOrg(orgCode) helper that builds the auth URL for switching a user into a different organization. It sets org_code to the target org and forces prompt=login
(overriding any prompt already configured on the flow) so the callback re-authenticates in the new org's context instead of silently reusing the old session.

Added two tests: one checks org_code and prompt=login show up correctly alongside other configured auth params, the other checks it overrides a previously set prompt
value.

Checklist

• I have read the "Pull requests" section in the contributing
  guidelines.
• I agree to the terms within the code of conduct.

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Team

Run ID: 86cce8eb-4274-4c00-ad96-33f480e41abd

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