[FIR] Check context receivers in FirStandardOverrideChecker

#KT-61145 Fixed

compiler/testData/diagnostics/tests/override/contextReceivers.fir.kt

@@ -0,0 +1,21 @@
+// LANGUAGE: +ContextReceivers
+
+interface I {
+    context(String, Int) fun foo()
+}
+
+class C1 : I {
+    context(String, Int) override fun foo() {}
+}
+
+<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>class C2<!> : I {
+    context(String) <!NOTHING_TO_OVERRIDE!>override<!> fun foo() {}
+}
+
+<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>class C3<!> : I {
+    context(Int, String) <!NOTHING_TO_OVERRIDE!>override<!> fun foo() {}
+}
+
+<!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>class C4<!> : I {
+    context(String, Float) <!NOTHING_TO_OVERRIDE!>override<!> fun foo() {}
+}

compiler/testData/diagnostics/tests/override/contextReceivers.kt

@@ -0,0 +1,21 @@
+// LANGUAGE: +ContextReceivers
+
+interface I {
+    context(String, Int) fun foo()
+}
+
+class C1 : I {
+    context(String, Int) override fun foo() {}
+}
+
+class C2 : I {
+    context(String) override fun foo() {}
+}
+
+class C3 : I {
+    context(Int, String) override fun foo() {}
+}
+
+class C4 : I {
+    context(String, Float) override fun foo() {}
+}