chore(build): gradle 7 (#188)

* chore(build): gradle 7

* chore(build): getByType vs fineByType

* chore(build): runtimeOnly

* chore(build): remove bintray

* fix(tests): Fix the issue with SpinnakerExtensionGradlePluginFunctionalTest during gradle 7.6 upgrade

 While upgrade of gradle 7.6, faced the failure of tests "compatibility test task succeeds if failing test is not required" and "can run an end-to-end build, including compatibility test". The reason being the unpredictable execution of tasks (unrelated to each other) given as argument in Gradlerunner testkit.
https://github.com/spinnaker/spinnaker-gradle-project/blob/e00c77502311b2112a268c5ea0233573cd29f7c2/spinnaker-extensions/src/functionaltest/kotlin/com/netflix/spinnaker/gradle/extension/SpinnakerExtensionGradlePluginFunctionalTest.kt#L83
 In order to fix, established the conditional ordering between unrelated task of "compatibilityTest" and "releaseBundle"

* test(extensions): remove compatibiity test of gradle version 6.8.1

With upgrade of gradle version 7.6.1 in spinnaker-gradle-project, the code has been modified to remove deprecations. It cause compatibility tests to break with gradle version 6.8.1, so removing it.

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Co-authored-by: j-sandy <30489233+j-sandy@users.noreply.github.com>

Author: mattgogerly

gradle/wrapper/gradle-wrapper.jar

@@ -1,5 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.1-bin.zip
+networkTimeout=10000
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists