* fix for date based flag support to make the after and before flags not inclusive of the selected date
* updated search posts tests using date flags to take into account new non inclusive of the selected date behavior of those flags
* initial implementation of after, before, on search flags allowing to restrict the search to a specific day or a date range
* missed setting beforeDate in SearchParams in one place
* fixed condition when only flags are used for search without any plain terms
* changed date format used for after/before/on flags to be in ISO8601 format as suggested in PR comments, added a helper function to pad month and day with zeroes allowing the user user either format, with or without leading zeroes
* corrected expected compare to date setting for the TestParseDateFilterToTimeISO8601 test
* fixed a bug for the scenario when you only have the date flags without any terms, added a couple of tests for that scenario
* updated the date filter logic to use parameters to construct the query instead of simply appending strings together, as suggested in the pull request comments
* added search unit test using date flags
* added a helper function to create a test post with a createat date manually set, updated the test for search using date flags to create test posts with different createat dates to be able to better test the functionality
* MM-11817 Add support for after/before/on search flags with Elasticsearch
* add support to search posts to perform the search in context of the client's timezone when filtering by createat date using on: after: before: flags
* updated tests to match the new signature
* MM-11065: Allow to search and get archived channels from the API
* Fixing more tests
* Add some unit tests
* Add includeDeleted parameter to session permissions check function
* More test fixing
* Adding archive channels list in channels search
* Add restriction for archived channel edition
* Reverting permissions checks modification
* Changed the query parameter to include_deleted
* Enable search archive channels as true by default
* Adding tests for verify search on deleted channels
* Allowing to override archive channels during the imports
* Fixed test
* Search in archive channels from the API must be explicitly requested
* Removing includeDeleted parameter from GetChannelByName and GetChannelByNameForTeam
* Back to ViewArchivedChannels config
* Fixing tests
* Reverting GetChannelByName parameter
* Add include deleted parameter on GetChannel functions in plugins api
* Fixing tests
