💚️ Upload coverage results for all host platforms to codecov

[madchutney]

Description

Code coverage had dropped to 30% because the coverage was only being uploaded for Linux. Normally this is ok but for Mbed Devices there is a large amount of host platform specific code.

Test Coverage

• This change is covered by existing or additional automated tests.
• Manual testing has been performed (and evidence provided) as automated testing was not feasible.
• Additional tests are not required for this change (e.g. documentation update).

[codecov]

Codecov Report

Merging #25 into master will increase coverage by 62.77%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #25       +/-   ##
===========================================
+ Coverage   30.98%   93.76%   +62.77%     
===========================================
  Files          29       29               
  Lines         994      994               
===========================================
+ Hits          308      932      +624     
+ Misses        686       62      -624     

Impacted Files	Coverage Δ
...es/_internal/windows/component_descriptor_utils.py	100.00% <0.00%> (+5.88%)	⬆️
mbed_devices/_internal/detect_candidate_devices.py	100.00% <0.00%> (+25.00%)	⬆️
mbed_devices/_internal/windows/device_detector.py	72.22% <0.00%> (+72.22%)	⬆️
mbed_devices/_internal/utils/python_helpers.py	72.72% <0.00%> (+72.72%)	⬆️
..._devices/_internal/windows/usb_data_aggregation.py	76.92% <0.00%> (+76.92%)	⬆️
mbed_devices/_internal/windows/serial_port.py	84.21% <0.00%> (+84.21%)	⬆️
mbed_devices/_internal/windows/volume_set.py	86.95% <0.00%> (+86.95%)	⬆️
mbed_devices/_internal/windows/usb_hub.py	87.30% <0.00%> (+87.30%)	⬆️
...ndows/disk_partition_logical_disk_relationships.py	95.45% <0.00%> (+95.45%)	⬆️
mbed_devices/_internal/windows/disk_aggregation.py	95.60% <0.00%> (+95.60%)	⬆️
... and 6 more