update import/export for attachments and new file paths (#22915)

* update import/export for attachments and new file paths

* add unit test

* update templates test

* temp checking

* cleanup

* cleanup

* more cleanup

* lint fixes

* cleanup some functions

* cleanup

* fix build breaks

* fix tests for changes

* move function to different file

* more cleanup, code movement

* unit test fixes

* add unit tests

* fix tests

* more unit test fixes

* test fix

* revert package-lock.json

* fixes from code review

* fix export image

* more fixes to remove attachmentId

* change from removed api

* update test

* lint fixes

* update for review comments

* fix tests

* test fix

* lint fix

* remove sprintf from logging, use mlog

* more lint fixes

* Update server/boards/app/files.go

Co-authored-by: Doug Lauder <wiggin77@warpmail.net>

* remove code

---------

Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: Doug Lauder <wiggin77@warpmail.net>

server/boards/integrationtests/permissions_test.go

@@ -3379,7 +3379,7 @@ func TestPermissionsGetFile(t *testing.T) {
 		clients := setupClients(th)
 		testData := setupData(t, th)
 
-		newFileID, err := th.Server.App().SaveFile(bytes.NewBuffer([]byte("test")), "test-team", testData.privateBoard.ID, "test.png")
+		newFileID, err := th.Server.App().SaveFile(bytes.NewBuffer([]byte("test")), "test-team", testData.privateBoard.ID, "test.png", false)
 		require.NoError(t, err)
 
 		ttCases := ttCasesF()
@@ -3394,7 +3394,7 @@ func TestPermissionsGetFile(t *testing.T) {
 		clients := setupLocalClients(th)
 		testData := setupData(t, th)
 
-		newFileID, err := th.Server.App().SaveFile(bytes.NewBuffer([]byte("test")), "test-team", testData.privateBoard.ID, "test.png")
+		newFileID, err := th.Server.App().SaveFile(bytes.NewBuffer([]byte("test")), "test-team", testData.privateBoard.ID, "test.png", false)
 		require.NoError(t, err)
 
 		ttCases := ttCasesF()