[MM-44434] Introduced search for channel id's through system console. (#20259)

* Introduced search for channel id's

* Small fix to test case as it is not looking at count

* Introduced searching channels by id as a ChannelOpt. Defaulting to true for system console for the time being

* go fmt

* Modified whether to include search by id by passing it in as prop to search endpoint. Modified webapp to pass through search by id as well

* Fixed issue with full text search, as there is not always necessarily an index on Id.

* Modified test to verify count, and moved code inside conditional

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

store/storetest/channel_store.go

@@ -6448,6 +6448,7 @@ func testChannelStoreSearchAllChannels(t *testing.T, ss store.Store) {
 		{"Filter team 1 and team 2, public and private and group constrained", "", store.ChannelSearchOpts{IncludeDeleted: false, TeamIds: []string{t1.Id, t2.Id}, Public: true, Private: true, GroupConstrained: true, Page: model.NewInt(0), PerPage: model.NewInt(5)}, model.ChannelList{&o5}, 1},
 		{"Filter team 1 and team 2, public and private and exclude group constrained", "", store.ChannelSearchOpts{IncludeDeleted: false, TeamIds: []string{t1.Id, t2.Id}, Public: true, Private: true, ExcludeGroupConstrained: true, Page: model.NewInt(0), PerPage: model.NewInt(5)}, model.ChannelList{&o1, &o2, &o3, &o4, &o6}, 12},
 		{"Filter deleted returns only deleted channels", "", store.ChannelSearchOpts{Deleted: true, Page: model.NewInt(0), PerPage: model.NewInt(5)}, model.ChannelList{&o13}, 1},
+		{"Search ChannelA by id", o1.Id, store.ChannelSearchOpts{IncludeDeleted: false, Page: model.NewInt(0), PerPage: model.NewInt(5), IncludeSearchById: true}, model.ChannelList{&o1}, 1},
 	}
 
 	for _, testCase := range testCases {