Hermes scripts: rename tarball methods to distinguish between source code and prebuilt artifacts

[hramos]

Summary:
There are two tarballs: the source code for Hermes that is downloaded from GitHub, and the hermes-runtime-darwin-{}-v{}.tar.gz tarball with prebuilt artifacts that is built in CI.
Renamed some methods to make it clearer which tarball they work with.

Changelog: [internal]

Reviewed By: cipolleschi, dmytrorykun

Differential Revision: D40812290

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D40812290

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,003,369	+0
android	hermes	armeabi-v7a	6,379,713	+0
android	hermes	x86	7,416,216	+0
android	hermes	x86_64	7,280,112	+0
android	jsc	arm64-v8a	8,868,341	+0
android	jsc	armeabi-v7a	7,606,658	+0
android	jsc	x86	8,926,237	+0
android	jsc	x86_64	9,409,481	+0

Base commit: 76c7cca
Branch: main

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 76c7cca
Branch: main

[pull-bot]

PR build artifact for 4fad965 is ready.
To use, download tarball from "Artifacts" tab in this CircleCI job then run yarn add <path to tarball> in your React Native project.

[pull-bot]

PR build artifact for 4fad965 is ready.
To use, download tarball from "Artifacts" tab in this CircleCI job then run yarn add <path to tarball> in your React Native project.

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D40812290

[pull-bot]

PR build artifact for b98d831 is ready.
To use, download tarball from "Artifacts" tab in this CircleCI job then run yarn add <path to tarball> in your React Native project.

[pull-bot]

PR build artifact for b98d831 is ready.
To use, download tarball from "Artifacts" tab in this CircleCI job then run yarn add <path to tarball> in your React Native project.

[react-native-bot]

This pull request was successfully merged by @hramos in 8f124be.

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