Unify error logging and improve sentry logs

[Sonje]

Changes:

• improved error interface for ApiErrors
• unified error logging across the slices
• added Sentry logs to errors from requests
• moved Sentry initialization into a separate utility function
• added discern between different environments(staging, experimental, production), removed development environment from Sentry logging
• updated Sentry library
• I chose null for errors instead of undefined as it leads to more clear results - we have full control over errors, we are clearing them with each state change and there will be no unexpected "undefineds"
• reused default async thunk withing fixed sessions to fetchDormantFixedSessions (simplification while still using isAdditional arg)
• added types wherever they were missing

[Sonje]

Fix Sentry setup