bug(cli): switching to an invalid context breaks ado

[AlessandroPomponio]

Issue

Running

ado context an-invalid-context

Works no matter what if the context exists, because no checks are performed whether the context is actually valid or not.

Upon running any other kind of command, however, if the context isn't valid, Pydantic will raise ValidationErrors which will prevent the user from running anything else, even switching context.

Example

(ado-core) alessandropomponio@MacBook-Pro-di-Alessandro ~/D/G/p/ado ((8684a72e))> ado context ap-testing
  warnings.warn(
Success! Now using context ap-testing
(ado-core) alessandropomponio@MacBook-Pro-di-Alessandro ~/D/G/p/ado ((8684a72e))> ado upgrade stores
  warnings.warn(
ERROR:  The provided project context was not valid:
        2 validation errors for ProjectContext
metadataStore.mysql.active
  Extra inputs are not permitted 
    For further information visit https://errors.pydantic.dev/2.12/v/extra_forbidden
sslVerify
  Extra inputs are not permitted 
    For further information visit https://errors.pydantic.dev/2.12/v/extra_forbidden
(ado-core) alessandropomponio@MacBook-Pro-di-Alessandro ~/D/G/p/ado ((8684a72e)) [1]> ado context ft-prod
  warnings.warn(
ERROR:  The provided project context was not valid:
        2 validation errors for ProjectContext
metadataStore.mysql.active
  Extra inputs are not permitted 
    For further information visit https://errors.pydantic.dev/2.12/v/extra_forbidden
sslVerify
  Extra inputs are not permitted 
    For further information visit https://errors.pydantic.dev/2.12/v/extra_forbidden
(ado-core) alessandropomponio@MacBook-Pro-di-Alessandro ~/D/G/p/ado ((8684a72e)) [1]> ado context local
  warnings.warn(
ERROR:  The provided project context was not valid:
        2 validation errors for ProjectContext
metadataStore.mysql.active
  Extra inputs are not permitted 
    For further information visit https://errors.pydantic.dev/2.12/v/extra_forbidden
sslVerify
  Extra inputs are not permitted 
    For further information visit https://errors.pydantic.dev/2.12/v/extra_forbidden
(ado-core) alessandropomponio@MacBook-Pro-di-Alessandro ~/D/G/p/ado ((8684a72e)) [1]> ado template context --local-context
  warnings.warn(
ERROR:  The provided project context was not valid:
        2 validation errors for ProjectContext
metadataStore.mysql.active
  Extra inputs are not permitted 
    For further information visit https://errors.pydantic.dev/2.12/v/extra_forbidden
sslVerify
  Extra inputs are not permitted 
    For further information visit https://errors.pydantic.dev/2.12/v/extra_forbidden