Stream manager max bandwidth calculation is wrong

[MikeDombo]

Max bandwidth is calculated by reading STREAM_MANAGER_EXPORTER_MAX_BANDWIDTH which is specified as kbps, but the console is assuming it is the number of bytes/s leading to incorrect display

https://github.com/aws-greengrass/aws-greengrass-localdebugconsole/blob/main/src/main/js/dashboard-frontend/src/components/StreamManager.tsx#L257 -- need to first divide by 8 here to go from bits to bytes and multiply by 1024 to go from KB to B