CI: Fix coverage analysis for qemu and native_sim

[ceolin]

With changes done in a1cdf27 we were not getting coverage data from qemu and native_sim.

It fixes the issue putting the full simulator name in the simulator list.

[gbarkadiusz]

This list of simulators is not the list of simulators where the coverage data are collected on.
It's only for parsing/counting all testcases per three categories sim_only, hw_only, mixed according to the following lines.

if any(platform in testsuite['platform'] for platform in self.simulators):
    if test_suite['status'] == "":
        test_suite['status'] = 'sim_only'
    if test_suite['status'] == 'hw_only':
        test_suite['status'] = 'mixed'
else:
    if test_suite['status'] == "":
        test_suite['status'] = 'hw_only'
    if test_suite['status'] == 'sim_only':
        test_suite['status'] = 'mixed'

then

if i_testsuit['status'] == "hw_only":
    hw_only_count += 1
elif i_testsuit['status'] == "sim_only":
    sim_only_count += 1
else:
    mixed_count += 1