[jdk17u-dev] RFR: 8273153: Consolidate file_exists into os:file_exists

[Elif Aslan]

Clean backport to Consolidate file_exists into os:file_exists

Additional testing in addition to GHA tests

jtreg/tier2

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Commit messages:
 - Backport 9732fbe428c3b6a5422cc94e7295ba5482d1a7a9

Changes: https://git.openjdk.org/jdk17u-dev/pull/2281/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2281&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8273153
  Stats: 26 lines in 4 files changed: 9 ins; 13 del; 4 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2281.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2281/head:pull/2281

PR: https://git.openjdk.org/jdk17u-dev/pull/2281