RFR: 8319313: G1: Rename G1EvacFailureInjector appropriately

[Thomas Schatzl]

Hi all,

  please review this rename of `G1EvacFailureInjector` and associated options to `G1AllocationFailureInjector` according to the results of the discussion for the review of [JDK-8318706](https://bugs.openjdk.org/browse/JDK-8318706).

To facilitate review the first commit implements the renaming changes, the second moves the affected files only.

Testing: gha, local gc/g1 tests

Thanks,
  Thomas

-------------

Commit messages:
 - renames
 - Initial version, fix up g1EvacuationFailure -> g1AllocationFailure in various variants

Changes: https://git.openjdk.org/jdk/pull/16905/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16905&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319313
  Stats: 727 lines in 19 files changed: 343 ins; 335 del; 49 mod
  Patch: https://git.openjdk.org/jdk/pull/16905.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16905/head:pull/16905

PR: https://git.openjdk.org/jdk/pull/16905