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Resolves #2262
Description
Changes purchases#create error flash to provide full error messages.
To stay in line with precedent set for error handling I referred to partners#create
Type of change
How Has This Been Tested?
Adds context block for failed purchase creation in purchase_system_spec.rb which contains added test, also moves a similiar test for failed purchase creation concerning item dropdown to within said block.

Had to edit purchase request POST#create failure test, the previous assertion was different:

I copied the test that was in the partners_request_spec POST#create failure test. I'm unsure if this is ok, I'm unfamiliar with the assertion that was previously there which stopped working once I changed the error message.
Screenshots