Expose public/ API as submodule (#23345)

* model -> public/model

* plugin -> public/plugin

* public/model/utils -> public/utils

* platform/shared/mlog -> public/shared/mlog

* platform/shared/i18n -> public/shared/i18n

* platform/shared/markdown -> public/shared/markdown

* platform/services/timezones -> public/shared/timezones

* channels/einterfaces -> einterfaces

* expose public/ submodule

* go mod tidy

* .github: cache-dependency-path, setup-go-work

* modules-tidy for public/ too

* remove old gomodtidy

server/einterfaces/mocks/ClusterMessageHandler.go

@@ -0,0 +1,35 @@
+// Code generated by mockery v2.23.2. DO NOT EDIT.
+
+// Regenerate this file using `make einterfaces-mocks`.
+
+package mocks
+
+import (
+	model "github.com/mattermost/mattermost-server/server/public/model"
+	mock "github.com/stretchr/testify/mock"
+)
+
+// ClusterMessageHandler is an autogenerated mock type for the ClusterMessageHandler type
+type ClusterMessageHandler struct {
+	mock.Mock
+}
+
+// Execute provides a mock function with given fields: msg
+func (_m *ClusterMessageHandler) Execute(msg *model.ClusterMessage) {
+	_m.Called(msg)
+}
+
+type mockConstructorTestingTNewClusterMessageHandler interface {
+	mock.TestingT
+	Cleanup(func())
+}
+
+// NewClusterMessageHandler creates a new instance of ClusterMessageHandler. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
+func NewClusterMessageHandler(t mockConstructorTestingTNewClusterMessageHandler) *ClusterMessageHandler {
+	mock := &ClusterMessageHandler{}
+	mock.Mock.Test(t)
+
+	t.Cleanup(func() { mock.AssertExpectations(t) })
+
+	return mock
+}