Deserialize Assets with their Sig (#16073)

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# Description

Deserialize Assets with their Sig field set. This is necessary to round
trip them. This matches the behavior of Archives.

Fixes pulumi/pulumi-go-provider#234

## Checklist

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- [x] I have run `make lint` to verify my code passes the lint check
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- [x] I have added tests that prove my fix is effective or that my
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- [x] I have run `make changelog` and committed the
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changelog/pending/20240426--pkg--deserialze-assets-with-their-sig.yaml

@@ -0,0 +1,4 @@
+changes:
+- type: fix
+ scope: pkg
+ description: deserialze assets with their sig

sdk/go/common/resource/asset/asset.go

@@ -213,7 +213,7 @@ func Deserialize(obj map[string]interface{}) (*Asset, bool, error) {
  uri = u
  }
 
- return &Asset{Hash: hash, Text: text, Path: path, URI: uri}, true, nil
+ return &Asset{Sig: AssetSig, Hash: hash, Text: text, Path: path, URI: uri}, true, nil
 }
 
 // HasContents indicates whether or not an asset's contents can be read.

sdk/go/common/resource/asset_test.go

@@ -65,6 +65,7 @@ func TestAssetSerialize(t *testing.T) {
  assert.True(t, assetDes.IsText())
  assert.Equal(t, text, assetDes.Text)
  assert.Equal(t, "e34c74529110661faae4e121e57165ff4cb4dbdde1ef9770098aa3695e6b6704", assetDes.Hash)
+ assert.Equal(t, AssetSig, assetDes.Sig)
 
  // another text asset with the same contents, should hash the same way.
  text2 := "a test asset"
@@ -135,6 +136,7 @@ func TestAssetSerialize(t *testing.T) {
  assert.True(t, assetDes.IsPath())
  assert.Equal(t, file, assetDes.Path)
  assert.Equal(t, "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", assetDes.Hash)
+ assert.Equal(t, AssetSig, assetDes.Sig)
 
  arch, err := rarchive.FromAssets(map[string]interface{}{"foo": asset})
  assert.NoError(t, err)
@@ -176,6 +178,7 @@ func TestAssetSerialize(t *testing.T) {
  assert.True(t, assetDes.IsURI())
  assert.Equal(t, url, assetDes.URI)
  assert.Equal(t, "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", assetDes.Hash)
+ assert.Equal(t, AssetSig, assetDes.Sig)
 
  arch, err := rarchive.FromAssets(map[string]interface{}{"foo": asset})
  assert.NoError(t, err)
@@ -215,6 +218,7 @@ func TestAssetSerialize(t *testing.T) {
  assert.True(t, isasset)
  assert.True(t, emptyDes.IsText())
  assert.Equal(t, "", emptyDes.Text)
+ assert.Equal(t, AssetSig, emptyDes.Sig)
 
  // Check that a text asset with it's text removed shows as "no content".
  asset, err := rasset.FromText("a very different and special test asset")