[BEAM-2233,BEAM-2223] Adjust TestSparkPipelineOptions registration; add per-runner profiles to Java 8 examples pom

[kennknowles]

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We have cascading failures:

• All runners were included together in the include-runners profile in the Java 8 examples
• TestOptions has a hard dep on hamcrest that we list as provided, putting a burden on users
• TestSparkPipelineOptions was registered, so the Spark runner had this same hard dep and class load time
• If you do options.as(MyUnregisteredOptions.class) this will cause TestPipeline/PipelineOptionsFactory to crash with a parse error even if none of the unregistered options were present

These should all be fixed, IMO as follows:

• Runners should have separate profiles (done in this PR)
• TestOptions should either not use hamcrest or should declare a correct dependency (not resolved)
• TestSparkPipelineOptions should either not need to be registered or should be allowed to be registered (expected resolution: no need to register)
• TestPipeline / PipelineOptionsFactory should not crash due to how options have been observed, when they are not mutated, and probably should just not crash at all

[kennknowles]

run spark validatesrunner

[kennknowles]

retest this please

[kennknowles]

I have manually run the Spark ValidatesRunner tests and eventually got them to succeed via the method of registering the test options only in src/test.

[davorbonaci]

LGTM

[kennknowles]

run spark validatesrunner

[davorbonaci]

All passed. Merging.