RFR: 8327238: Remove MetadataAllocationFailALot* develop flags

[Thomas Schatzl]

Hi all,

  please review this trivial removal of the `MetadataFailAlot` flags; one of them,
`MetadataAllocationFailALotInterval` is unused anyway, and the other `MetadataAllocationFailALot` only prevents the attempt to retry metadata allocation in the VM operation.

This functionality does not seem to stress metadata allocation failure at all, just execution of the metadata VM operation, so I decided to just drop the second flag as well.

I considered keeping it maybe as `MetadataAllocationFailRetry` or something, but decided against it since it does not seem interesting to test. However I can at reviewer's request do that.

Testing: local compilation, gha, grepping hotspot tests/hotspot sources

Thanks,
  Thomas

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Commit messages:
 - 8327238

Changes: https://git.openjdk.org/jdk/pull/18133/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18133&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327238
  Stats: 12 lines in 2 files changed: 0 ins; 9 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/18133.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18133/head:pull/18133

PR: https://git.openjdk.org/jdk/pull/18133