refactor: [WLEO-241] Presentation StartFlow input parameters

[LazyAfternoons]

List of Changes

• Change the StartFlow input parameters which now takes requestUri and clientId instead of the whole URL, giving the consumer app the responsibility to parse the URL;
• Update tests.

Motivation and Context

This change is needed because the URL is already parsed and validated by the consumer app.

How Has This Been Tested?

Test a presentation flow.

Screenshots (if appropriate):

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.