Check for Dapr CLI on PATH

[philliphoff]

Currently the Dapr CLI is looked for at several very specific locations, depending on the platform. With this change, Aspire will default to the Dapr CLI found on PATH, if any. If none is found, falls back to one of those specific locations.

Resolves #2219

Microsoft Reviewers: Open in CodeFlow

[davidfowl]

Can you do this instead?

aspire/src/Aspire.Hosting.Azure/Provisioning/Provisioners/BicepProvisioner.cs

Lines 398 to 420 in 31ce95b

	private static string? FindFullPathFromPath(string command) => FindFullPathFromPath(command, Environment.GetEnvironmentVariable("PATH"), Path.PathSeparator, File.Exists);
	private static string? FindFullPathFromPath(string command, string? pathVariable, char pathSeparator, Func<string, bool> fileExists)
	{
	Debug.Assert(!string.IsNullOrWhiteSpace(command));
	if (OperatingSystem.IsWindows())
	{
	command += ".cmd";
	}
	foreach (var directory in (pathVariable ?? string.Empty).Split(pathSeparator))
	{
	var fullPath = Path.Combine(directory, command);
	if (fileExists(fullPath))
	{
	return fullPath;
	}
	}
	return null;
	}