* tests for detection engine get/put utils

* increases unit test code statement coverage to 100% for search_after / bulk index reindexer

* removes mockLogger declaration from individual test cases - clears mock counts before each test case runs so as to not accumulate method calls after each test case

* resets default paging size to 1000 - typo from when I was working through my tests

* updates tests after rebase with master

* fixes type check after fixing test from rebase with master

* removes undefined from maxSignals in type definition, updates tests with pure jest function implementations of logger and services - modifying only the return values or creating a mock implementation when necessary, removed some overlapping test cases

* fixes type issue

* replaces mock implementation with mock return value for unit test

* removes mock logger expected counts, just check if error logs are called, don't care about debug / warn etc.

* fixes more type checks after rebase with master