Kotlin: locate generated data-class copy params at their property

A data class's generated `copy(...)` has one value parameter per
primary-constructor property. The K1 frontend records each such
parameter (and its type accesses) at the source location of the
corresponding property; the K2 frontend leaves them with undefined
offsets, which the extractor emits as a `0:0:0:0` location.

This divergence is purely a K2 information regression: the richer K1
location is unambiguously better (it points at the real property in
source, enabling location-based queries), so we converge K2 onto K1
rather than the other way around.

Because K2 exposes no PSI back-mapping, the location cannot be
recomputed from source; instead we recover it from the IR. For a value
parameter of a `GENERATED_DATA_CLASS_MEMBER` function whose own offsets
are undefined, we look up the primary-constructor parameter at the same
index and reuse its location.

Guards keep the change surgical:
  - `vp.startOffset >= 0` bails out, so K1 (which already has real
    offsets) is untouched.
  - the origin must be `GENERATED_DATA_CLASS_MEMBER`.
  - the primary-ctor parameter name must match and carry real offsets,
    which restricts the remap to `copy`-style parameters and excludes
    members such as `equals(other)`.

Relearned both suites: only data-class `copy` parameter rows change
(K2 now matches K1). data-classes/PrintAst.expected becomes byte
-identical across suites; the residual diffs in methods/{exprs,
parameters}.expected are pre-existing, unrelated divergences.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

java/ql/test-kotlin2/library-tests/data-classes/PrintAst.expected

@@ -17,11 +17,11 @@ dc.kt:
 #    0|     3: [Method] copy
 #    0|       3: [TypeAccess] ProtoMapValue
 #-----|       4: (Parameters)
-#    0|         0: [Parameter] bytes
-#    0|           0: [TypeAccess] byte[]
-#    0|         1: [Parameter] strs
-#    0|           0: [TypeAccess] String[]
-#    0|             0: [TypeAccess] String
+#    1|         0: [Parameter] bytes
+#    1|           0: [TypeAccess] byte[]
+#    1|         1: [Parameter] strs
+#    1|           0: [TypeAccess] String[]
+#    1|             0: [TypeAccess] String
 #    0|       5: [BlockStmt] { ... }
 #    0|         0: [ReturnStmt] return ...
 #    0|           0: [ClassInstanceExpr] new ProtoMapValue(...)

java/ql/test-kotlin2/library-tests/methods/exprs.expected

@@ -48,7 +48,6 @@
 | dataClass.kt:0:0:0:0 | String | TypeAccess |
 | dataClass.kt:0:0:0:0 | String | TypeAccess |
 | dataClass.kt:0:0:0:0 | String | TypeAccess |
-| dataClass.kt:0:0:0:0 | String | TypeAccess |
 | dataClass.kt:0:0:0:0 | boolean | TypeAccess |
 | dataClass.kt:0:0:0:0 | copy(...) | MethodCall |
 | dataClass.kt:0:0:0:0 | false | BooleanLiteral |
@@ -60,7 +59,6 @@
 | dataClass.kt:0:0:0:0 | int | TypeAccess |
 | dataClass.kt:0:0:0:0 | int | TypeAccess |
 | dataClass.kt:0:0:0:0 | int | TypeAccess |
-| dataClass.kt:0:0:0:0 | int | TypeAccess |
 | dataClass.kt:0:0:0:0 | new DataClass(...) | ClassInstanceExpr |
 | dataClass.kt:0:0:0:0 | other | VarAccess |
 | dataClass.kt:0:0:0:0 | other | VarAccess |
@@ -114,6 +112,7 @@
 | dataClass.kt:1:22:1:31 | int | TypeAccess |
 | dataClass.kt:1:22:1:31 | int | TypeAccess |
 | dataClass.kt:1:22:1:31 | int | TypeAccess |
+| dataClass.kt:1:22:1:31 | int | TypeAccess |
 | dataClass.kt:1:22:1:31 | this | ThisAccess |
 | dataClass.kt:1:22:1:31 | this.x | VarAccess |
 | dataClass.kt:1:22:1:31 | x | VarAccess |
@@ -125,6 +124,7 @@
 | dataClass.kt:1:34:1:46 | String | TypeAccess |
 | dataClass.kt:1:34:1:46 | String | TypeAccess |
 | dataClass.kt:1:34:1:46 | String | TypeAccess |
+| dataClass.kt:1:34:1:46 | String | TypeAccess |
 | dataClass.kt:1:34:1:46 | Unit | TypeAccess |
 | dataClass.kt:1:34:1:46 | this | ThisAccess |
 | dataClass.kt:1:34:1:46 | this | ThisAccess |

java/ql/test-kotlin2/library-tests/methods/parameters.expected

@@ -1,6 +1,6 @@
 | clinit.kt:3:1:3:20 | setTopLevelInt | clinit.kt:3:1:3:20 | <set-?> | 0 |
-| dataClass.kt:0:0:0:0 | copy | dataClass.kt:0:0:0:0 | x | 0 |
-| dataClass.kt:0:0:0:0 | copy | dataClass.kt:0:0:0:0 | y | 1 |
+| dataClass.kt:0:0:0:0 | copy | dataClass.kt:1:22:1:31 | x | 0 |
+| dataClass.kt:0:0:0:0 | copy | dataClass.kt:1:34:1:46 | y | 1 |
 | dataClass.kt:0:0:0:0 | copy$default | dataClass.kt:0:0:0:0 | p0 | 0 |
 | dataClass.kt:0:0:0:0 | copy$default | dataClass.kt:0:0:0:0 | p1 | 1 |
 | dataClass.kt:0:0:0:0 | copy$default | dataClass.kt:0:0:0:0 | p2 | 2 |