Enable customization of org id and name when connecting to uaa-base endpoint

[vuil]

Also: update the ucp url to the correct one for uaa-based endpoints

What this PR does / why we need it

Which issue(s) this PR fixes

Fixes #

Describe testing done for PR

Ran unit tests.
Additional manually tested the following:

# verify env vars are picked up

> TANZU_CLI_SM_ORGANIZATION_NAME=testsm TANZU_CLI_SM_ORGANIZATION_ID=dcc5a0d5-92bd-4580-..... /bin/tanzu login --endpoint https://hubsm-host/ --insecure-skip-tls-verify

[i] Opening the browser window to complete the login
Log in by visiting this link:

    https://hubsm-host/oauth/authorize?client_id=tp_cli_app&code_challenge=wIM6VMLFW1EuJH6vow17fFgvYHdyn2jqIHBWK2UjBMw&code_challenge_method=S256&redirect_uri=http%3A%2F%2F127.0.0.1%3A51009%2Fcallback&response_type=code&state=bc39ff2c76ebd543474cfb83d7cb0870

    Optionally, paste your authorization code: [...]

[ok] Successfully logged in to 'https://hubsm-host/' and created a tanzu context

> tanzu context current
  Name:            tpsm-a436fc44
  Type:            tanzu
  Organization:    testsm (dcc5a0d5-92bd-4580-aa24-76f603e004b2)
  Project:         test (9fd5e29a-d556-459e-b1f8-137f605e8550)
  Kube Config:     /Users/johndoe/.config/tanzu/kube/config
  Kube Context:    tanzu-cli-tpsm-a436fc44:test

> grep -C2 testsm ~/.config/tanzu/config-ng.yaml
        tanzuMissionControlEndpoint: https://hubsm-host
        tanzuOrgID: dcc5a0d5-92bd-4580-aa24-76f603e004b2
        tanzuOrgName: testsm
currentContext:
    tanzu: tpsm-a436fc44

> grep -C2 dcc5a0d5-92bd-4580-aa24-76f603e004b2 ~/.config/tanzu/kube/config
- cluster:
    insecure-skip-tls-verify: true
    server: https://hubsm-host/dcc5a0d5-92bd-4580-aa24-76f603e004b2
  name: tanzu-cli-tpsm-a436fc44
contexts:

# verify that generated kube config is usable against UCP

> ./bin/tanzu project list
Listing projects from testsm org

  NAME  AGE  INTEGRATIONS
  abcd  26h  TANZU_APPLICATION_ENGINE
  test  26h  TANZU_APPLICATION_ENGINE

To set your active project use 'tanzu project use NAME'

> ./bin/tanzu project use test
Successfully set project to test
> ./bin/tanzu space list
No Spaces found.

> ./bin/tanzu avt list
No availability targets found.

Release note

Enable TANZU_CLI_SM_ORGANIZATION_NAME TANZU_CLI_SM_ORGANIZATION_ID to configure the Org name and id of a self-managed Tanzu Platform environment.

Additional information

Special notes for your reviewer

[anujc25]

LGTM.