Populate fileType also when MQTT protocol is in use

[ileonovAmzn]

Currently in job_parser.c, fileType field from the job document is only parsed and populated into the AfrOtaJobDocumentFields_t struct if protocol value is not "MQTT": it is done in populateHttpStreamingFields().

In AWS IoT Core console, when creating an OTA job, fileType can be populated also when MQTT protocol is selected for the job.

We are using the Jobs-for-AWS-IoT-embedded-sdk library with a job over MQTT protocol and we would like to set fileType value in the job document to indicate to our OTA agent what type of content the job has.

I suggest to move fileType parsing code to populateCommonFields() from populateHttpStreamingFields().

[kstribrnAmzn]

Thanks for submitting the issue! This seems like a reasonable change. I'm reaching out to the jobs team to verify the filetype is always included for both MQTT and HTTP transmission.

[kstribrnAmzn]

I've raised this PR to add what you've requested. I'm still debugging coverage issues in our CI job. I'd like to get those figured out before pushing.

Feel free to try this and let me know if it works.

[DakshitBabbar]

Thanks @ileonovAmzn for bringing this issue to our notice. The PR to resolve this has been merged, hence closing this issue now.