Fix MKLLUFactorization test for Julia LTS (v1.10)

MKLLUFactorization still has runtime dispatch issues in BLAS logging code
on Julia < 1.12. The runtime dispatches occur in:
- Base._str_sizehint and print (stdlib)
- LinearSolve._format_context_pair
- Base.CoreLogging functions

These are fixed by improved type inference in Julia 1.12+, so:
- Mark as broken for Julia < 1.12 (LTS and 1.11)
- Expect to pass on Julia >= 1.12

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ChrisRackauckas

test/nopre/jet.jl

@@ -97,8 +97,13 @@ end
 
     # Platform-specific factorizations (may not be available on all systems)
     if @isdefined(MKLLUFactorization)
-        # MKLLUFactorization now passes on all Julia versions
-        JET.@test_opt solve(prob, MKLLUFactorization())
+        # MKLLUFactorization has runtime dispatch in BLAS logging on Julia < 1.12
+        # Passes on Julia 1.12+ due to improved type inference
+        if VERSION < v"1.12.0-"
+            JET.@test_opt solve(prob, MKLLUFactorization()) broken=true
+        else
+            JET.@test_opt solve(prob, MKLLUFactorization())
+        end
     end
 
     if Sys.isapple() && @isdefined(AppleAccelerateLUFactorization)