Run `fuchsia_precache` on presubmit just on engine rolls

[jmagman]

There's a framework test called fuchsia_precache which runs (in presubmit on every PR) flutter precache --fuchsia in a Linux VM #139202

flutter/dev/bots/test.dart

Lines 1620 to 1642 in 0d528b8

	Future<void> _runFuchsiaPrecache() async {
	printProgress('${green}Running flutter precache tests$reset');
	await runCommand(
	'flutter',
	<String>[
	'config',
	'--enable-fuchsia',
	],
	workingDirectory: flutterRoot,
	);
	await runCommand(
	'flutter',
	<String>[
	'precache',
	'--flutter_runner',
	'--fuchsia',
	'--no-android',
	'--no-ios',
	'--force',
	],
	workingDirectory: flutterRoot,
	);
	}

However it looks like this was never intended to be a tool precache test, it was a Cirrus pseudo setup task to make sure the fuchsia artifacts are available on the bot before rolling the engine #50822 and was moved to https://flutter-review.googlesource.com/c/recipes/+/5120.

Zach mentions this may be the only place before the g3 roll that checks if those artifacts were published, so it would be good to keep for engine roll presubmits.

[github-actions]

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