Adds a ConnectedWorkspaces.MaxPostsPerSync configuration property (#28154)

* Adds a ConnectedWorkspaces.MaxPostsPerSync configuration property

* Fix linter

server/public/model/config.go

@@ -265,6 +265,8 @@ const (
 	OpenidSettingsDefaultScope = "profile openid email"
 
 	LocalModeSocketPath = "/var/tmp/mattermost_local.socket"
+
+	ConnectedWorkspacesSettingsDefaultMaxPostsPerSync = 50 // a bit more than 4 typical screenfulls of posts
 )
 
 func GetDefaultAppCustomURLSchemes() []string {
@@ -3278,6 +3280,7 @@ type ConnectedWorkspacesSettings struct {
 	EnableSharedChannels            *bool
 	EnableRemoteClusterService      *bool
 	DisableSharedChannelsStatusSync *bool
+	MaxPostsPerSync                 *int
 }
 
 func (c *ConnectedWorkspacesSettings) SetDefaults(isUpdate bool, e ExperimentalSettings) {
@@ -3300,6 +3303,10 @@ func (c *ConnectedWorkspacesSettings) SetDefaults(isUpdate bool, e ExperimentalS
 	if c.DisableSharedChannelsStatusSync == nil {
 		c.DisableSharedChannelsStatusSync = NewPointer(false)
 	}
+
+	if c.MaxPostsPerSync == nil {
+		c.MaxPostsPerSync = NewPointer(ConnectedWorkspacesSettingsDefaultMaxPostsPerSync)
+	}
 }
 
 type GlobalRelayMessageExportSettings struct {