Ensure flag restoration logic is always executed in SetFeatureFlagsRule.

`base.evaluate()` can be interrupted by other rules in the chain, such
as DevSdkIgnoreRule, if an assumption fails. This prevents
SetFeatureFlagsRule from executing its flag value restoration logic,
leading to an inconsistent state. This change ensures the restoration
logic runs regardless of exceptions.

Flag: EXEMPT mainline
Bug: 440618747
Test: TH
Change-Id: Iba4483b45f11aeed8ae565f8080b2bebd299046c

staticlibs/testutils/devicetests/com/android/testutils/SetFeatureFlagsRule.kt

@@ -16,6 +16,7 @@
 
 package com.android.testutils.com.android.testutils
 
+import com.android.testutils.tryTest
 import org.junit.rules.TestRule
 import org.junit.runner.Description
 import org.junit.runners.model.Statement
@@ -90,10 +91,12 @@ class SetFeatureFlagsRule(
 
                 // Execute the test method, which includes methods annotated with
                 // @Before, @Test and @After.
-                base.evaluate()
-
-                valuesToBeRestored.forEach {
-                    setFlagsMethod(it.key, it.value)
+                tryTest {
+                    base.evaluate()
+                } cleanup {
+                    valuesToBeRestored.forEach {
+                        setFlagsMethod(it.key, it.value)
+                    }
                 }
             }
         }