Fix the PoP flow in the console app (#887)

* Fix PoP flow in the test app

Currently the test app sends both PoP parameters (see placeholder_auth_scheme definition)
and also passes req_cnf and token type. There parameters are not
compatible. If application passes PoP parameters, then MSAL (or the
broker) owns the key and does the signing of the SHR. If application
passes req_cnf, then application owns the key and creates and signs the
SHR, so in this case it should not pass PoP parameters.

The main flow is the first one - application passes only PoP parameters
and either MSAL or the broker owns the key and generates the SHR.

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

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Co-authored-by: Petar Dimov <petard@ntdev.microsoft.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>