MM-15422: Adds new parameters for retrieving pages of channels. (#10903)

* MM-15422: Adds new parameters for retrieving pages of channels and searching channels.

* MM-15422: Appends excluded channel names with defaults. Adds separate struct for data-tier option parameter.

model/channel.go

@@ -80,6 +80,20 @@ type DirectChannelForExport struct {
 	Members *[]string
 }
 
+// ChannelSearchOpts contains options for searching channels.
+//
+// NotAssociatedToGroup will exclude channels that have associated, active GroupChannels records.
+// ExcludeDefaultChannels will exclude the configured default channels (ex 'town-square' and 'off-topic').
+// IncludeDeleted will include channel records where DeleteAt != 0.
+// ExcludeChannelNames will exclude channels from the results by name.
+//
+type ChannelSearchOpts struct {
+	NotAssociatedToGroup   string
+	ExcludeDefaultChannels bool
+	IncludeDeleted         bool
+	ExcludeChannelNames    []string
+}
+
 func (o *Channel) DeepCopy() *Channel {
 	copy := *o
 	if copy.SchemeId != nil {

model/channel_search.go

@@ -11,7 +11,9 @@ import (
 const CHANNEL_SEARCH_DEFAULT_LIMIT = 50
 
 type ChannelSearch struct {
-	Term string `json:"term"`
+	Term                   string `json:"term"`
+	ExcludeDefaultChannels bool   `json:"exclude_default_channels"`
+	NotAssociatedToGroup   string `json:"not_associated_to_group"`
 }
 
 // ToJson convert a Channel to a json string