Convert ResourceSet ctor calls to factory method

Most current invocations of the ResourceSet constructor shouldn't
care about any new dimensions we add to restrict test execution. This
change allows us to make those changes, keep the ResourceSet ctor
symmetrical, and avoid contaminating those ctor call sites with noise.

--
MOS_MIGRATED_REVID=86826112
diff --git a/src/main/java/com/google/devtools/build/lib/exec/SymlinkTreeHelper.java b/src/main/java/com/google/devtools/build/lib/exec/SymlinkTreeHelper.java
index 6127cee..a3a6d7d 100644
--- a/src/main/java/com/google/devtools/build/lib/exec/SymlinkTreeHelper.java
+++ b/src/main/java/com/google/devtools/build/lib/exec/SymlinkTreeHelper.java
@@ -45,7 +45,7 @@
    * their directory creations get non-interleaved allocations. So we give them
    * a huge resource cost.
    */
-  public static final ResourceSet RESOURCE_SET = new ResourceSet(1000, 0.5, 0.75);
+  public static final ResourceSet RESOURCE_SET = ResourceSet.createWithRamCpuIo(1000, 0.5, 0.75);
 
   private final PathFragment inputManifest;
   private final PathFragment symlinkTreeRoot;