chore(liveness/no-light): move start api call to component mount

[esauerbo]

Description of changes

Moves the call to StartFaceLivenessSession (invoked by initializeLivenessStream) to the controlling component, FaceLivenessDetectorCore.

Old flow: Click "start video check", enter start state, detect face/distance, enter initializeLivenessStream
New flow: EnterinitializeLivenessStream, click "start video check", enter start state, detect face/distance

Since the state machine is initialized in FaceLivenessDetectorCore here, initializeLivenessStream is automatically invoked on the component mount.

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• Have read the Pull Request Guidelines
• PR description included
• Relevant documentation is changed or added (and PR referenced)
• yarn test passes and tests are updated/added
• No side effects or sideEffects field updated

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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