chore: Raise SourceFormatError instead of SkippedAwardError when outside handle_skipped_award

[jpmckinney]

fixes #311

This fix assumes that we don't want to do the following instead:

Or, if we want to allow processing to continue, we need to add handle_skipped_award inside the for-loop in _get_awards_from_data_source. That said, if keys are missing, it might be a sign that the response format has changed, in which case we would expect all awards to fail.

[coveralls]

Pull Request Test Coverage Report for Build 10333964690

Details

• 2 of 3 (66.67%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.005%) to 86.454%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
app/commands.py	1	2	50.0%
<!--	Total:	2	3	66.67%	-->

Totals
Change from base Build 10333825387:	0.005%
Covered Lines:	2036
Relevant Lines:	2355

---

💛 - Coveralls