Tests: remove diagnostic tests which are present elsewhere

- `typeParameterWithTwoBounds.kt` is already present in
  `diagnostics/testsWithJvmBackend/duplicateJvmSignature/erasure/`.
- `clashWithCompanionObjectField.kt` is already present in
  `codegen/box/fieldRename/jvmFieldNoClash1.kt`.
- `jvmFieldAndJavaGetter.kt` is already present in
  `codegen/box/jvmField/noClashWithInheritedJavaMethod.kt`.

In case of two latter tests on JvmField, there's (correctly) no error
reported in JVM IR, which is why those are box tests.

compiler/testData/diagnostics/testsWithStdLib/annotations/jvmField/clashWithCompanionObjectField.fir.kt

@@ -1,8 +0,0 @@
-class A {
-
-    @JvmField val clash = 1;
-
-    companion object {
-        val clash = 1;
-    }
-}

compiler/testData/diagnostics/testsWithStdLib/annotations/jvmField/clashWithCompanionObjectField.kt

@@ -1,8 +0,0 @@
-class A {
-
-    <!CONFLICTING_JVM_DECLARATIONS!>@JvmField val clash<!> = 1;
-
-    companion object {
-        <!CONFLICTING_JVM_DECLARATIONS!>val clash<!> = 1;
-    }
-}

compiler/testData/diagnostics/testsWithStdLib/annotations/jvmField/clashWithCompanionObjectField.txt

@@ -1,17 +0,0 @@
-package
-
-public final class A {
-    public constructor A()
-    @field:kotlin.jvm.JvmField public final val clash: kotlin.Int = 1
-    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-
-    public companion object Companion {
-        private constructor Companion()
-        public final val clash: kotlin.Int = 1
-        public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-        public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-        public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
-    }
-}