CDF-20144: remove wdl tests and mark deprecated

wdl didn't hit GA and has no active usage through Scala SDK
and so no active usage through spark-datasource either.

Let's start by removing tests and marking deprecated.
Removing tests has a benefit of getting closer to being able
to run repo tests in any project (wdl tests can only be run in
dedicated projects with wdl access anyway).

[CDF-20144]

build.sbt

@@ -26,7 +26,7 @@ lazy val commonSettings = Seq(
   organization := "com.cognite.spark.datasource",
   organizationName := "Cognite",
   organizationHomepage := Some(url("https://cognite.com")),
-  version := "3.2." + patchVersion,
+  version := "3.3." + patchVersion,
   isSnapshot := patchVersion.endsWith("-SNAPSHOT"),
   crossScalaVersions := supportedScalaVersions,
   semanticdbEnabled := true,

src/main/scala/cognite/spark/v1/DefaultSource.scala

@@ -55,6 +55,7 @@ class DefaultSource
     new SequenceRowsRelation(config, sequenceId)(sqlContext)
   }
 
+  @deprecated("wdl support is deprecated", since = "0")
   private def createWellDataLayer(
       parameters: Map[String, String],
       config: RelationConfig,
@@ -174,7 +175,7 @@ class DefaultSource
       case FlexibleDataModelRelationFactory.ResourceType =>
         createFlexibleDataModelRelation(parameters, config, sqlContext)
       case "welldatalayer" =>
-        createWellDataLayer(parameters, config, sqlContext)
+        createWellDataLayer(parameters, config, sqlContext): @annotation.nowarn
       case _ => sys.error("Unknown resource type: " + resourceType)
     }
   }
@@ -241,7 +242,7 @@ class DefaultSource
         case FlexibleDataModelRelationFactory.ResourceType =>
           createFlexibleDataModelRelation(parameters, config, sqlContext)
         case "welldatalayer" =>
-          createWellDataLayer(parameters, config, sqlContext)
+          createWellDataLayer(parameters, config, sqlContext): @annotation.nowarn
         case _ => sys.error(s"Resource type $resourceType does not support save()")
       }
       val batchSizeDefault = relation match {

src/main/scala/cognite/spark/v1/wdl/JsonObjectToRow.scala

@@ -5,6 +5,7 @@ import io.circe.{Json, JsonObject}
 import org.apache.spark.sql.Row
 import org.apache.spark.sql.types._
 
+@deprecated("wdl support is deprecated", since = "0")
 object JsonObjectToRow {
   implicit class RequiredOption[T](optionValue: Option[T]) {
     def orThrow(structFieldName: String, nullable: Boolean, dataType: DataType): Option[T] =

src/main/scala/cognite/spark/v1/wdl/RowToJson.scala

@@ -14,6 +14,7 @@ import java.time.{Instant, LocalDate}
 import scala.collection.mutable
 
 // sscalastyle:off
+@deprecated("wdl support is deprecated", since = "0")
 object RowToJson {
 
   /**

src/main/scala/cognite/spark/v1/wdl/WdlExceptions.scala

@@ -3,10 +3,12 @@ package cognite.spark.v1.wdl
 import cognite.spark.v1.CdfSparkException
 import org.apache.spark.sql.types.DataType
 
+@deprecated("wdl support is deprecated", since = "0")
 class RequiredFieldIsNullException(val structFieldName: String, val dataType: DataType)
     extends CdfSparkException(
       s"Required field `${structFieldName}` of type `${dataType.typeName}` should not be NULL.")
 
+@deprecated("wdl support is deprecated", since = "0")
 class WrongFieldTypeException(
     val structFieldName: String,
     val expectedDataType: DataType,

src/main/scala/cognite/spark/v1/wdl/WdlModels.scala

@@ -3,24 +3,28 @@ package cognite.spark.v1.wdl
 import cognite.spark.v1.CdfSparkException
 import io.circe.{Json, JsonObject}
 
+@deprecated("wdl support is deprecated", since = "0")
 case class WdlModel(
     shortName: String,
     ingest: Option[WdlIngestDefinition],
     retrieve: WdlRetrieveDefinition
 )
 
+@deprecated("wdl support is deprecated", since = "0")
 case class WdlIngestDefinition(
     schemaName: String,
     url: String
 )
 
+@deprecated("wdl support is deprecated", since = "0")
 case class WdlRetrieveDefinition(
     schemaName: String,
     url: String,
     isGet: Boolean = false,
     transformBody: JsonObject => JsonObject = it => it
 )
 
+@deprecated("wdl support is deprecated", since = "0")
 object WdlModels {
   val models: Seq[WdlModel] = Seq(
     WdlModel(

src/main/scala/cognite/spark/v1/wdl/WellDataLayerRDD.scala

@@ -12,6 +12,7 @@ import org.apache.spark.{Partition, SparkContext, TaskContext}
 
 import scala.collection.AbstractIterator
 
+@deprecated("wdl support is deprecated", since = "0")
 class WellDataLayerRDD(
     @transient override val sparkContext: SparkContext,
     val schema: StructType,

src/main/scala/cognite/spark/v1/wdl/WellDataLayerRelation.scala

@@ -7,6 +7,7 @@ import org.apache.spark.sql.sources.TableScan
 import org.apache.spark.sql.types.{DataType, StructType}
 import org.apache.spark.sql.{Row, SQLContext}
 
+@deprecated("wdl support is deprecated", since = "0")
 class WellDataLayerRelation(
     config: RelationConfig,
     model: String