[MM-53454] Add export file settings + slash command for public link (#23915)

Co-authored-by: Mattermost Build <build@mattermost.com>

server/platform/shared/filestore/mocks/FileBackendWithLinkGenerator.go

@@ -0,0 +1,62 @@
+// Code generated by mockery v2.23.2. DO NOT EDIT.
+
+// Regenerate this file using `make filestore-mocks`.
+
+package mocks
+
+import (
+	time "time"
+
+	mock "github.com/stretchr/testify/mock"
+)
+
+// FileBackendWithLinkGenerator is an autogenerated mock type for the FileBackendWithLinkGenerator type
+type FileBackendWithLinkGenerator struct {
+	mock.Mock
+}
+
+// GeneratePublicLink provides a mock function with given fields: path
+func (_m *FileBackendWithLinkGenerator) GeneratePublicLink(path string) (string, time.Duration, error) {
+	ret := _m.Called(path)
+
+	var r0 string
+	var r1 time.Duration
+	var r2 error
+	if rf, ok := ret.Get(0).(func(string) (string, time.Duration, error)); ok {
+		return rf(path)
+	}
+	if rf, ok := ret.Get(0).(func(string) string); ok {
+		r0 = rf(path)
+	} else {
+		r0 = ret.Get(0).(string)
+	}
+
+	if rf, ok := ret.Get(1).(func(string) time.Duration); ok {
+		r1 = rf(path)
+	} else {
+		r1 = ret.Get(1).(time.Duration)
+	}
+
+	if rf, ok := ret.Get(2).(func(string) error); ok {
+		r2 = rf(path)
+	} else {
+		r2 = ret.Error(2)
+	}
+
+	return r0, r1, r2
+}
+
+type mockConstructorTestingTNewFileBackendWithLinkGenerator interface {
+	mock.TestingT
+	Cleanup(func())
+}
+
+// NewFileBackendWithLinkGenerator creates a new instance of FileBackendWithLinkGenerator. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
+func NewFileBackendWithLinkGenerator(t mockConstructorTestingTNewFileBackendWithLinkGenerator) *FileBackendWithLinkGenerator {
+	mock := &FileBackendWithLinkGenerator{}
+	mock.Mock.Test(t)
+
+	t.Cleanup(func() { mock.AssertExpectations(t) })
+
+	return mock
+}