feat: Remove original file stem from filenames in the blobstorage (#4309)

This way filenames in the blobstorage are just random hex numbers. This also allows us to get rid of
the `sanitize-filename` dependency.

This also requires `Param::Filename` to be set to "debug_logging*.xdc" for messages containing
logging webxdc-s, otherwise they are not detected properly. This is done in "fix:
Message::set_file_from_bytes(): Set Param::Filename", so don't forget to update senders as well.

python/tests/test_1_online.py

@@ -182,13 +182,11 @@ def test_send_file_twice_unicode_filename_mangling(tmp_path, acfactory, lp):
     msg = send_and_receive_message()
     assert msg.text == "withfile"
     assert open(msg.file_path).read() == "some data"
-    msg.file_path.index(basename)
     assert msg.file_path.endswith(ext)
 
     msg2 = send_and_receive_message()
     assert msg2.text == "withfile"
     assert open(msg2.file_path).read() == "some data"
-    msg2.file_path.index(basename)
     assert msg2.file_path.endswith(ext)
     assert msg.file_path != msg2.file_path
 
@@ -215,7 +213,6 @@ def test_send_file_html_attachment(tmp_path, acfactory, lp):
     msg = ac2.get_message_by_id(ev.data2)
 
     assert open(msg.file_path).read() == content
-    msg.file_path.index(basename)
     assert msg.file_path.endswith(ext)
 
 

python/tests/test_2_increation.py

@@ -50,7 +50,6 @@ class TestOnlineInCreation:
         src = tmp_path / "file.txt"
         src.write_text("hello there\n")
         msg = chat.send_file(str(src))
-        assert msg.file_path.startswith(os.path.join(ac1.get_blobdir(), "file"))
         assert msg.file_path.endswith(".txt")
 
     def test_forward_increation(self, acfactory, data, lp):