Mock constant search in JPS tests

jps-plugin/testData/incremental/pureKotlin/constantValueChanged/build.log

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+================ Step #1 =================
+
+Cleaning output files:
+  out/production/module/META-INF/module.kotlin_module
+  out/production/module/test/ConstKt.class
+End of files
+Compiling files:
+  src/const.kt
+End of files
+Marked as dirty by Kotlin:
+  src/usage.kt
+Exit code: ADDITIONAL_PASS_REQUIRED
+------------------------------------------
+Cleaning output files:
+  out/production/module/META-INF/module.kotlin_module
+  out/production/module/test/UsageKt.class
+End of files
+Compiling files:
+  src/usage.kt
+End of files
+Exit code: OK
+------------------------------------------

jps-plugin/testData/incremental/pureKotlin/constantValueChanged/const.kt

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+package test
+
+const val CONST = "foo"

jps-plugin/testData/incremental/pureKotlin/constantValueChanged/const.kt.new

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+package test
+
+const val CONST = "bar"

jps-plugin/testData/incremental/pureKotlin/constantValueChanged/dummy.kt

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+package test
+
+fun dummy() {}

jps-plugin/testData/incremental/pureKotlin/constantValueChanged/usage.kt

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+package test
+
+fun usage() {
+    println(CONST)
+}