Fix inductive-implicits benchmark (#22007)

The `inductive-implicits` benchmark fails on the benchmarks machine
since April 2024:

<img width="1261" alt="image"
src="https://github.com/user-attachments/assets/2b53a1e8-5a5d-4c76-a795-b4733d975f5b">

This _should_ have been caught by the tests at:


https://github.com/scala/scala3/blob/912b6f278b0fe5e7a25160612922cadf184acdbb/compiler/test/dotty/tools/dotc/BootstrappedOnlyCompilationTests.scala#L30

When I run `scala3-bootstrapped / testOnly
dotty.tools.dotc.BootstrappedOnlyCompilationTests -- *posMacros`
locally, the tests are indeed failing and the following error is
printed:

```scala
64 |  val sel = Selector[L, Boolean]
   |                                ^
   |No given instance of type shapeless.Selector[Test.L, Boolean] was found for parameter selector of method apply in object Selector.
   |I found:
   |
   |    shapeless.Selector.inTail[Int,
   |      Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |         Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int
   |         :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |        Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int
   |        :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |        Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: ...Int :: ... :: ... :: ...,
   |    Boolean](
   |      shapeless.Selector.inTail[Int,
   |        Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int
   |          :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |           Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |          Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |          Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |          Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: ...Int :: ... :: ... :: ...,
   |      Boolean](
   |        shapeless.Selector.inTail[Int,
   |          Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |            Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |            Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |            Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |            Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |            Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: ...Int :: ... :: ... :: ...,
   |        Boolean](
 
...

   |            )
   |          )
   |        )
   |      )
   |    )
   |
   |But method inTail in object Selector does not match type shapeless.Selector[
   |  Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int :: Int ::
   |     Boolean :: shapeless.HNil,
   |Boolean].
   |
   |Note: method inTail in object Selector was not considered because it was not imported with `import given`.
```

It is not clear to me why the test does not fail on the CI. I checked
that `dotty.tools.dotc.BootstrappedOnlyCompilationTests.posMacros`
indeed runs there, and I confirm it is the case.

Anyway, the fix is simple, we just need to import the implicits
explicitly.

This PR additionally removes the duplicate
`tests/pos-deep-subtype/inductive-implicits-bench.scala`.

Author: hamzaremmal

tests/bench/inductive-implicits.scala

@@ -174,49 +174,49 @@ object Test extends App {
     Int ::
     Int ::
 //
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-//
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-//
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-//
-    Int ::
-    Int ::
-    Int ::
-    Int ::
-    Int ::
 //    Int ::
 //    Int ::
 //    Int ::
 //    Int ::
 //    Int ::
+//    Int ::
+//    Int ::
+//    Int ::
+//    Int ::
+//    Int ::
+// //
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+// //
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+// //
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
+//     Int ::
 // //
 //     Int ::
 //     Int ::