[BEAM-8602] Use shadow configuration for remaining DirectRunner dependencies

[TheNeuralBit]

R: @lukecwik

Post-Commit Tests Status (on master branch)

Lang	SDK	Apex	Dataflow	Flink	Gearpump	Samza	Spark
Go		---	---		---	---
Java
Python		---			---	---
XLang	---	---	---		---	---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website
Non-portable
Portable	---		---	---

See .test-infra/jenkins/README for trigger phrase, status and link of all Jenkins jobs.

[TheNeuralBit]

I grepped the build.gradle files to look for any other instances of adding the direct runner as a dependency dynamically, and couldn't find anything else:

❯ grep -iIrn "runners:direct-java" **/build.gradle | grep -v shadow
build.gradle:154:  dependsOn ":runners:direct-java:needsRunnerTests"
release/build.gradle:33:  dependsOn ":runners:direct-java:runQuickstartJavaDirect"
release/build.gradle:38:  dependsOn ":runners:direct-java:runMobileGamingJavaDirect"
runners/direct-java/build.gradle:154:// Generates :runners:direct-java:runQuickstartJavaDirect
runners/direct-java/build.gradle:157:// Generates :runners:direct-java:runMobileGamingJavaDirect
sdks/java/testing/load-tests/build.gradle:40:        : ":runners:direct-java")
sdks/java/testing/load-tests/build.gradle:78:  // to not hardcode any runner other than :runners:direct-java
sdks/java/testing/nexmark/build.gradle:35:        ?: ":runners:direct-java"
sdks/java/testing/nexmark/build.gradle:85:  // to not hardcode any runner other than :runners:direct-java
sdks/java/testing/nexmark/build.gradle:107://       Defaults to ":runners:direct-java"