[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>

app/channel.go

@@ -2780,6 +2780,7 @@ func (a *App) SearchAllChannels(term string, opts model.ChannelSearchOpts) (mode
 		ExcludeGroupConstrained:  opts.ExcludeGroupConstrained,
 		PolicyID:                 opts.PolicyID,
 		IncludePolicyID:          opts.IncludePolicyID,
+		IncludeSearchById:        opts.IncludeSearchById,
 		ExcludePolicyConstrained: opts.ExcludePolicyConstrained,
 		Public:                   opts.Public,
 		Private:                  opts.Private,