Make ContextPayloadProcessor spec more robust

Sean McGivernrequested to merge
make-context-payload-processor-spec-more-robust into master

This spec intends to test that we deep merge information from the application context into the Sentry event. It appears that prior specs can leak some application context (or some Sentry context), but we can make the spec more robust and truer to the intent by using include instead of eq.

For #326649 (closed).

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