FIR: fix source of callee reference in delegated constructor call

Previously the callee reference of a delegated constructor call is
always the same as the call itself. This violates the contract that no
two FIR elements can have identical sources.  In addition, this sets the
entire call expression as the source of the callee expression.

This change instead sets the proper constructor ref as the callee.

Also fixed EXPLICIT_DELEGATION_CALL_REQUIRED type. It should be an error
instead of a warning.

compiler/fir/analysis-tests/testData/resolve/diagnostics/propertyTypeMismatchOnOverride.kt

@@ -26,7 +26,7 @@ class G<E : Double>(val balue: E) : F<E>(balue) {
     override var rest: E = balue
 }
 
-class H<E : String>(val balue: E) : <!INAPPLICABLE_CANDIDATE{LT}!><!INAPPLICABLE_CANDIDATE{PSI}!>F<E><!>(balue)<!> {
+class H<E : String>(val balue: E) : <!INAPPLICABLE_CANDIDATE!>F<E><!>(balue) {
     override var rest: E = balue // no report because of INAPPLICABLE_CANDIDATE
 }
 

compiler/fir/analysis-tests/testData/resolve/diagnostics/returnTypeMismatchOnOverride.kt

@@ -27,7 +27,7 @@ class G<E : Double>(val balue: E) : F<E>(balue) {
     override fun rest(): E = balue
 }
 
-class H<E : String>(val balue: E) : <!INAPPLICABLE_CANDIDATE{LT}!><!INAPPLICABLE_CANDIDATE{PSI}!>F<E><!>(balue)<!> {
+class H<E : String>(val balue: E) : <!INAPPLICABLE_CANDIDATE!>F<E><!>(balue) {
     override fun rest(): E = balue // no report because of INAPPLICABLE_CANDIDATE
 }