rename source to logInActionSource

Summary:
Rename source (connected with session context) to logInActionSource to avoid redacting it from reports.

_task: ENG-2131

Test Plan:

1. Typecheck
2. Check if logInActionSource is properly passed to keyserver
3. Trrigger one of logInActionSource actions and trigger app crash in dev tools, check if logInActionSource is present in the action payload in the latest crash report from the database

example:

{
  "type": "SET_NEW_SESSION",
  "payload": {
    "sessionChange": {
      "cookieInvalidated": false,
      "currentUserInfo": {
        "id": "[redacted-3087747816]",
        "username": "[redacted-642983437]"
      }
    },
    "preRequestUserState": null,
    "logInActionSource": "SOCKET_AUTH_ERROR_RESOLUTION_ATTEMPT"
  }
},

4. Check if existing clients can log in (as described here: https://phab.comm.dev/D5517#163191)

Reviewers: tomek, atul, ashoat

Reviewed By: tomek, ashoat

Subscribers: ashoat, atul, abosh

Differential Revision: https://phab.comm.dev/D5517