fix(siwe): fix session checks and call onSignIn for 1CA

[Cali93]

Description

• Fixes a bug where onSignIn wasn't called in the 1CA flow.
• Sets the session state upon successful signature verification for 1CA.
• onNewAddress improvements
  • Fixes session checks as the session can be an empty object resulting in always being truthy.
  • Checks against the address in the current session, which is more reliable than previousAddress state variable.
• Fixes a bug where closing the modal would disconnect the user.

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)

Checklist

• [X] Code in this PR is covered by automated tests (Unit tests, E2E tests)
• [X] My changes generate no new warnings
• [X] I have reviewed my own code
• [X] I have filled out all required sections

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[ignaciosantise]

What happened with this? @Cali93 @tomiir

[lukaisailovic]

@Cali93 Should we merge this or close it?