pybind/mgr/telemetry: remove misleading tox env

For some reason there's a 'mypy' environment listed in the telemetry
tox.ini that always runs pytest. Remove it.
We'll see if this causes the CI to fail, as I can't find anywhere that
uses it.

Signed-off-by: John Mulligan <[email protected]>

Author: phlogistonjohn

src/pybind/mgr/telemetry/tox.ini

@@ -1,7 +1,6 @@
 [tox]
 envlist =
     py3
-    mypy
 skipsdist = true
 
 [testenv]