fix(expo): update scheme injection

[mikehardy]

This takes the contents of #504 and just does two things in order to get it done before I turn my attention elsewhere:

• rebases to master/head so CI will work
• runs and commits result of yarn validate:prettier:fix so CI will pass

Other than that all code is from @andrejpavlovic

Supercedes / Closes #504 Fixes #329

[github-actions[bot]]

:tada: This PR is included in version 12.1.5 :tada:

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