[K/N] Deprecate SharedImmutable annotation #KT-57837

As a part of efforts to stabilize Native stdlib.

kotlin-native/backend.native/tests/stdlib_external/text/StringEncodingTestNative.kt

@@ -7,8 +7,6 @@
 package test.text
 
 
-@SharedImmutable
 internal actual val surrogateCodePointDecoding: String = "\uFFFD".repeat(3)
 
-@SharedImmutable
 internal actual val surrogateCharEncoding: ByteArray = byteArrayOf(0xEF.toByte(), 0xBF.toByte(), 0xBD.toByte())

kotlin-native/backend.native/tests/stdlib_external/text/_IsCaseIgnorableTest.kt

@@ -12,7 +12,6 @@ package test.text
 
 import kotlin.test.*
 
-@SharedImmutable
 private val caseIgnorableRanges = arrayOf<IntRange>(
     0x0027..0x0027,
     0x002e..0x002e,

kotlin-native/backend.native/tests/stdlib_external/text/_IsCasedTest.kt

@@ -12,7 +12,6 @@ package test.text
 
 import kotlin.test.*
 
-@SharedImmutable
 private val casedRanges = arrayOf<IntRange>(
     0x0041..0x005a,
     0x0061..0x007a,