Summary:
This change factors out the Build HermesC for Linux job so that we can reuse the code in various workflows

## Changelog:
[Internal] - Factor out build-hermesc-linux for code reuse

Pull Request resolved: https://github.com/facebook/react-native/pull/45402

Test Plan: GHA are green

Reviewed By: cortinico

Differential Revision: D59673895

Pulled By: cipolleschi

fbshipit-source-id: f5c680d523866442d25317e880b4803ac89c3741