Deprecate react-unit-test-utils 9/15

[diana-villalvazo-wgu]

Remove use of 'shallow' (react-unit-test-utils) in following files:

• src/containers/LearnerDashboardHeader/ConfirmEmailBanner/index.test.jsx
• src/containers/LearnerDashboardHeader/index.test.jsx
• src/containers/MasqueradeBar/index.test.jsx
• src/containers/RelatedProgramsModal/components/ProgramCard.test.jsx
• src/containers/RelatedProgramsModal/index.test.jsx

[diana-villalvazo-wgu]

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