[MM-31247] Add support for compressed export files with attachments (#16614)

* Include filepaths for post attachments

* Cleanup

* Enable exporting file attachments

* Fix file import

* Enable zip export

* Support creating missing directories when unzipping

* Add test

* Add translations

* Export direct channel posts attachments

* Fix returned values order

Remove pointer to slice in return

* [MM-31597] Implement export process job (#16626)

* Implement export process job

* Add translations

* Remove unused value

* [MM-31249] Add /exports API endpoint (#16633)

* Implement API endpoints to list, download and delete export files

* Add endpoint for single resource

* Update i18n/en.json

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

* Update i18n/en.json

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

* Fix var name

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

model/config_test.go

@@ -1439,3 +1439,31 @@ func TestConfigImportSettingsIsValid(t *testing.T) {
 	require.NotNil(t, err)
 	require.Equal(t, "model.config.is_valid.import.retention_days_too_low.app_error", err.Id)
 }
+
+func TestConfigExportSettingsDefaults(t *testing.T) {
+	cfg := Config{}
+	cfg.SetDefaults()
+
+	require.Equal(t, "./export", *cfg.ExportSettings.Directory)
+	require.Equal(t, 30, *cfg.ExportSettings.RetentionDays)
+}
+
+func TestConfigExportSettingsIsValid(t *testing.T) {
+	cfg := Config{}
+	cfg.SetDefaults()
+
+	err := cfg.ExportSettings.isValid()
+	require.Nil(t, err)
+
+	*cfg.ExportSettings.Directory = ""
+	err = cfg.ExportSettings.isValid()
+	require.NotNil(t, err)
+	require.Equal(t, "model.config.is_valid.export.directory.app_error", err.Id)
+
+	cfg.SetDefaults()
+
+	*cfg.ExportSettings.RetentionDays = 0
+	err = cfg.ExportSettings.isValid()
+	require.NotNil(t, err)
+	require.Equal(t, "model.config.is_valid.export.retention_days_too_low.app_error", err.Id)
+}