[RN][iOS]Rename BUILD_FROM_SOURCE to RCT_BUILD_HERMES_FROM_SOURCE #43247
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Summary:
In OSS we have reports like this one where env variables from different settings might clash together, making react native apps fail to build hermes.
For example, a team might have defined a BUILD_FROM_SOURCE env variable to build their specific project from source and that will clash with how react native apps installs Hermes.
This change disambiguate the BUILD_FROM_SOURCE flag we have internally, moving to a less likely to clash RCT_BUILD_HERMES_FROM_SOURCE.
Changelog:
[iOS][Breaking] - Rename BUILD_FROM_SOURCE to RCT_BUILD_HERMES_FROM_SOURCE
Test Plan:
CircleCI