Fix remaining gradle7 deprecations (minus the ones from JB plugin) (#2421)

Author: hunterwerlla

build.gradle.kts

@@ -263,7 +263,7 @@ subprojects {
     }
 
     val testJar = tasks.register<Jar>("testJar") {
-        baseName = "${project.name}-test"
+        archiveBaseName.set("${project.name}-test")
         from(sourceSets.test.get().output)
         from(sourceSets.getByName("integrationTest").output)
     }

jetbrains-rider/build.gradle.kts

@@ -220,7 +220,7 @@ fun getNugetPackagesPath(): File {
 }
 
 dependencies {
-    compile(project(":jetbrains-core"))
+    implementation(project(":jetbrains-core"))
     testImplementation(project(":jetbrains-core", "testArtifacts"))
 }