[Bug]: new runs of test cases do not delete json file created

[mgheorghe]

Issue Description

Those files do not exist in github repo.
those files gets created without me running any test case in those folders

root@dash2:/home/...../sonic-mgmt# grep ./ -rn -e "cisco-8102-dut1"
grep: ./tests/_cache/vms-snappi-smartswitch/tbinfo.pickle: binary file matches
./tests/pfc_headroom_test_params/vms-snappi-smartswitch.json:3: "cisco-8102-dut1": {
./tests/priority/vms-snappi-smartswitch-lossy.json:3: "cisco-8102-dut1": []
./tests/priority/vms-snappi-smartswitch-all.json:3: "cisco-8102-dut1": []
./tests/priority/vms-snappi-smartswitch-lossless.json:3: "cisco-8102-dut1": []

Results you see

Those files do not exist in github repo.
those files gets created without me running any test case in those folders

root@dash2:/home/...../sonic-mgmt# grep ./ -rn -e "cisco-8102-dut1"
grep: ./tests/_cache/vms-snappi-smartswitch/tbinfo.pickle: binary file matches
./tests/pfc_headroom_test_params/vms-snappi-smartswitch.json:3: "cisco-8102-dut1": {
./tests/priority/vms-snappi-smartswitch-lossy.json:3: "cisco-8102-dut1": []
./tests/priority/vms-snappi-smartswitch-all.json:3: "cisco-8102-dut1": []
./tests/priority/vms-snappi-smartswitch-lossless.json:3: "cisco-8102-dut1": []

Results you expected to see

those files should be created only if tests is started and removed once test ends

Is it platform specific

generic

Relevant log output

NA

Output of show version

No response

Attach files (if any)

No response

[yxieca]

@sdszhang @wangxin for visibility

@selldinesh can you help take a look. My suggestions: if these files are cached information and can be used in next test without change, then they should go to the cache folder. Otherwise, cleanup is preferred.