MM-54123 Add group to channel (#22954)

* adding group members to channel initial commit

* adding group to channel functionality along with add new team members

* fixing circular dependency

* fixing e2e and other optimizations

* adding e2e tests for adding group members to channels

* cypress lint

* fixing comments

* adding count to button

* improvements

* adjusting some stuff from PR comments

* remove ability to add user to team, update message for non-team members

* remove adding to team from add groups functionality

* update misspelled variable

* lint and unit test fixes

* add tests, cleanup

* lint fix

* revert package-lock.json

* fixes for cypress tests

* rename TeamInviteBanner to TeamWarningBanner, since invites are no longer allowed

* update for warning

* lint fixes

* cleanup

* fix failing e2e tests

* update messages to not use markdown

---------

Co-authored-by: Scott Bishel <scott.bishel@mattermost.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/model/group.go

@@ -45,6 +45,7 @@ type Group struct {
 	AllowReference              bool        `json:"allow_reference"`
 	ChannelMemberCount          *int        `db:"-" json:"channel_member_count,omitempty"`
 	ChannelMemberTimezonesCount *int        `db:"-" json:"channel_member_timezones_count,omitempty"`
+	MemberIDs                   []string    `db:"-" json:"member_ids"`
 }
 
 func (group *Group) Auditable() map[string]interface{} {
@@ -133,6 +134,7 @@ type GroupSearchOpts struct {
 
 	IncludeChannelMemberCount string
 	IncludeTimezones          bool
+	IncludeMemberIDs          bool
 
 	// Include archived groups
 	IncludeArchived bool
@@ -143,6 +145,7 @@ type GroupSearchOpts struct {
 
 type GetGroupOpts struct {
 	IncludeMemberCount bool
+	IncludeMemberIDs   bool
 }
 
 type PageOpts struct {