Remove unused build.gradle files

frameworks/Kieker-java/build.gradle

-plugins {
-    id 'java'
-    id 'java-library'
-}
-
-dependencies {
-    implementation project(':tools:benchmark')
-    implementation 'net.kieker-monitoring:kieker:1.14'
-    implementation 'net.sourceforge.teetime:teetime:3.0'
-    implementation 'org.slf4j:slf4j-api:1.7.+'
-    implementation 'ch.qos.logback:logback-classic:1.2.3'  
-}

frameworks/inspectIT-java/build.gradle

-plugins {
-	id 'java'
-	id 'java-library'
-}
-
-dependencies {
-
-}