Fix the API Token generation URL in API token prompt

[prkalle]

What this PR does / why we need it

This PR fixes the API Token generation URL in API token prompt

Which issue(s) this PR fixes

Fixes #

Describe testing done for PR

Tested context creat with with both staging and production. The API token URLs(fetched from central config) are shown correctly in API token prompt.

❯ ./bin/tanzu context create
? Select context creation type Mission Control
? Enter control plane endpoint test.tmc.tanzu.com
? Give the context a name test

[i] The API key can be provided by setting the TANZU_API_TOKEN environment variable

[i] If you don't have an API token, visit the VMware Cloud Services console, select your organization, and create an API token with the TMC service roles:
  https://console.tanzu.broadcom.com/csp/gateway/portal/#/user/tokens

? API Token
[x] : interrupt

❯ ./bin/tanzu context create --staging
? Select context creation type Mission Control
? Enter control plane endpoint test.com
? Give the context a name test

[i] The API key can be provided by setting the TANZU_API_TOKEN environment variable

[i] If you don't have an API token, visit the VMware Cloud Services console, select your organization, and create an API token with the TMC service roles:
  https://console-stg.tanzu.broadcom.com/csp/gateway/portal/#/user/tokens

? API Token
[x] : interrupt

Release note

Additional information

Special notes for your reviewer

[marckhouzam]

LGTM
Maybe we can take this opportunity to change the URL in the quickstart.md guide? There are three examples that use the old URL

[prkalle]

Maybe we can take this opportunity to change the URL in the quickstart.md guide? There are three examples that use the old URL

The issuer URL is not mentioned in the docs. If you are referring to the https://api.tanzu.cloud.vmware.com URL , this is UCP endpoint URL and this has not changed yet. Thanks

[vuil]

lgtm, thanks