Add current build release

Previously, the build releases only included named releases so did not
have a way to represent the latest build release. This adds the current
build release (named after the current API level) to represent that.

Bug: 240406019
Test: m nothing
Change-Id: Ib8336da716b447448b23bc9684ce3be1ab78648a
diff --git a/sdk/testing.go b/sdk/testing.go
index bed11b2..f4e2b03 100644
--- a/sdk/testing.go
+++ b/sdk/testing.go
@@ -262,8 +262,7 @@
 
 	// If the generated snapshot builders not for the current release then it cannot be loaded by
 	// the current release.
-	currentBuildRelease := latestBuildRelease()
-	if snapshotBuildInfo.targetBuildRelease != currentBuildRelease {
+	if snapshotBuildInfo.targetBuildRelease != buildReleaseCurrent {
 		return
 	}