[cfggen] remove get_port_config_file_name helper function

[vdahiya12]

this PR addresses replacing get_port_config_file_name
function with device_info.get_path_to_port_config_file().
This is part of a larger clean up of functions which return
the port_config_file which reside outside of
sonic_py_common packages. This is motivated due to
redundancy of code as well as making it easier to change
the default behaviour of helper utility function returning
port_config_file unified in just sonic_py_common package
and in one place.

Signed-off-by: vaibhav-dahiya [email protected]

[jleveque]

Check builds will fail because the sonic-utilities submodule head is still referencing this function. Please open another PR to advance the sonic-utilities submodule to include your PR sonic-net/sonic-utilities#1069. Once that is merged, we can re-run the tests.

[vdahiya12]

closing this , code inside #5264