fix: allow single headers without specifying multi-value headers to b…

[sdelamo]

…e used

Close: #1928 #1942

Collapse single and multi-value headers as described in the AWS Lambda Docs:

The headers key can only contain single-value headers. The multiValueHeaders key can contain multi-value headers as well as single-value headers. If you specify values for both headers and multiValueHeaders, API Gateway merges them into a single list. If the same key-value pair is specified in both, only the values from multiValueHeaders will appear in the merged list.

In a production scenario, both multi and single are present, but I can see the appeal of specifying only one in a test.

[sonarcloud[bot]]

Quality Gate passed

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