Set installed property for installed platform when core search is executed (#2223)

* Set `Platform.Intalled` to the installed release

* Test that the json output contains `installed`

Author: MatteoPologruto

Diff for: commands/core/search.go

@@ -85,6 +85,9 @@ func PlatformSearch(req *rpc.PlatformSearchRequest) (*rpc.PlatformSearchResponse
 	out := make([]*rpc.Platform, len(res))
 	for i, platformRelease := range res {
 		out[i] = commands.PlatformReleaseToRPC(platformRelease)
+		if platformRelease.IsInstalled() {
+			out[i].Installed = platformRelease.Version.String()
+		}
 	}
 	// Sort result alphabetically and put deprecated platforms at the bottom
 	sort.Slice(

Diff for: internal/integrationtest/core/core_test.go

@@ -68,9 +68,13 @@ func TestCoreSearch(t *testing.T) {
 	require.NoError(t, err)
 	require.Greater(t, len(strings.Split(string(out), "\n")), 2)
 
+	_, _, err = cli.Run("core", "install", "arduino:[email protected]")
+	require.NoError(t, err)
 	out, _, err = cli.Run("core", "search", "avr", "--format", "json")
 	require.NoError(t, err)
 	requirejson.NotEmpty(t, out)
+	// Verify that "installed" is set
+	requirejson.Contains(t, out, `[{installed: "1.8.6"}]`)
 
 	// additional URL
 	out, _, err = cli.Run("core", "search", "test_core", "--format", "json", "--additional-urls="+url.String())