Merge #157928

157928: mmaprototype: move unused helper functions to constraint_unused.go r=tbg a=wenyihu6

Epic: CRDB-55052 
Release note: none

---
**mmaprototype: move unused helper functions to constraint_unused.go**

Previously, constraint.go included a few helper functions intended for future
production use but not currently in use. This commit moves those helpers into
their own dedicated file to make constraint.go smaller.

---
**mmaprototype: move unused helper functions to constraint_unused.go**

Previously, constraint_matcher.go included a few helper functions intended for future
production use but not currently in use. This commit moves those helpers into
their own dedicated file to make constraint_matcher.go smaller.



Co-authored-by: wenyihu6 <[email protected]>
Co-authored-by: Tobias Grieger <[email protected]>

Author: 3 people

pkg/kv/kvserver/allocator/mmaprototype/BUILD.bazel

@@ -43,6 +43,7 @@ go_test(
         "cluster_state_test.go",
         "constraint_matcher_test.go",
         "constraint_test.go",
+        "constraint_unused_test.go",
         "load_test.go",
         "memo_helper_test.go",
     ],