[Plan Page] It is too easy to accidentally purchase a plan on the wrong org

[souredoutlook]

What product do you want to improve?
Generally plans are purchased on organizations associated with projects are businesses. The default plan page is generally the one associated with your users organization.

Is your feature request related to a problem? Please describe.
Users frequently purchase a plan on the wrong org and ask to have their subscription transferred to the correct org.

Describe the solution you'd like
If a user is a member of two orgs (their own and another org) the plan page should default to the other org - especially on redirects (potentially related codecov/engineering-team#1219)

OR (more feasible)

A warning is shown when a user attempts to purchase a subscription associated with their user org.

OR (also more feasible)

Throw up a warning when someone tries to buy a plan on an org that has a singular member

Example image:

Describe alternatives you've considered
The alternative to improving the purchasing experience is to continue solving this issue via manual intervention on the support team.

Additional context
Support frequency anecdotally is about 5-10 requests every 2 weeks.

[souredoutlook]

Related to:

• https://sentry.zendesk.com/agent/tickets/145144
• https://sentry.zendesk.com/agent/tickets/145041
• https://sentry.zendesk.com/agent/tickets/142987
• https://sentry.zendesk.com/agent/tickets/144185
• https://sentry.zendesk.com/agent/tickets/144495
• https://sentry.zendesk.com/agent/tickets/144795
• https://sentry.zendesk.com/agent/tickets/144640

*from the last 2 weeks

[trent-codecov]

@codecovdesign to review this flow

[souredoutlook]

Probably related: https://sentry.zendesk.com/agent/tickets/145439