* WIP: creating topicSlice
* reformating reducer into toolkit slice and fixed tests
* removing unnecessary lines
* removing dismiss alert action and tests for actions
* removing unnecessary code
* adding tests for selectors
* adding test case for new topics
* adding test cases for topic reducer when fulfilled
* removing unnecessary code
* adding test cases for asyncthunks to increase coverage
* adding new test cases to cover topicSlice
* adding clear messsages fulfilled test case
* removing unnecessary code
