Remove sign in and sign out features - Closes #4317

[isalga]

What was the problem?

This PR resolves #4317

How was it solved?

• [x] Remove sign in
• [x] Remove sign out
• [x] Remove logic for auto logout
• [x] Remove unit tests related to sign in and sign out
• [x] Adopt unit test and e2e test

How was it tested?

[soroushm]

@isalga please don't merge the pr when is done

[ManuGowda]

This pull request can not be merged unless the change API objective is completed to support the way login to account to be able to create transaction or access endpoints. All of the SDK v5 features are closely integrated, so we intend to keep this PR until v6 API integration is completed.