RFR: 8378083: Mark shenandoah/generational/TestOldGrowthTriggers.java as flagless

[SendaoYan]

Hi all,

Test test/hotspot/jtreg/gc/shenandoah/generational/TestOldGrowthTriggers.java invoke ProcessTools.createLimitedTestJavaProcessBuilder call the test java process, I think we should mark this test as flagless to avoid duplication run when jtreg received extra jvm options.

This PR also remove the uesless 'import jdk.test.lib.Asserts' and fix the typo 'choose' in test/lib/jdk/test/lib/process/ProcessTools.java

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Commit messages:
 - Fix typo choose in test/lib/jdk/test/lib/process/ProcessTools.java
 - 8378083: Mark shenandoah/generational/TestOldGrowthTriggers.java as flagless

Changes: https://git.openjdk.org/jdk/pull/29756/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29756&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8378083
  Stats: 5 lines in 2 files changed: 1 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/29756.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29756/head:pull/29756

PR: https://git.openjdk.org/jdk/pull/29756