[3.14] gh-142387: Reduce Android testbed API level to 33 (GH-144315) (#144317)

The emulator images for API level 34 and 35 have significant issues with image size and
internet connectivity. Reverts the default API level used for testbed testing to 33.
(cherry picked from commit 6543720b63a62363de540deb5a6701f1ae431bce)

Co-authored-by: Malcolm Smith <smith@chaquo.com>