Improve performance of KAPT on JDK 17

Getting canonical path is expensive on JDK 17, thus check, whether
file is belongs to some folder becomes expensive.
In this commit implementation was replaced to a new one based on
File.getParent. It gives profit 49seconds-> 500 ms/100k files.
Note! Now if there are present two files which are actually links of the
same file, they are treated as two different files.
#KT-54579 Fixed

plugins/kapt3/kapt3-base/test/KaptPathsTest.kt

@@ -35,9 +35,8 @@ class KaptPathsTest {
 
             val symlinkToOtherJava = Files.createSymbolicLink(File(tempDir, "Other.java").toPath(), otherJava.toPath()).toFile()
             val symlinkToNotJava = Files.createSymbolicLink(File(tempDir, "NotJava.java").toPath(), notJava.toPath()).toFile()
-            val symlinkToJavaRootDir = Files.createSymbolicLink(File(tempDir, "java2").toPath(), javaRootDir.toPath()).toFile()
 
-            val javaRoots = listOf(simpleJava, symlinkToOtherJava, symlinkToNotJava, symlinkToJavaRootDir, javaRootDir)
+            val javaRoots = listOf(simpleJava, symlinkToOtherJava, symlinkToNotJava, javaRootDir)
 
             val paths = KaptOptions.Builder().apply {
                 javaSourceRoots.addAll(javaRoots)
@@ -53,7 +52,7 @@ class KaptPathsTest {
                 assertTrue(javaSourceFiles.any { it.toRelativeString(tempDir) == path }) { "Can't find path $path\nAvailable: $available" }
             }
 
-            assertEquals(4, javaSourceFiles.size)
+            assertEquals(4, javaSourceFiles.size, "Actual content: ${javaSourceFiles}")
             assertContains("Simple.java")
             assertContains("Other.java")
             assertContains("NotJava.java")