RFR: 8370813: Deprecate AggressiveHeap

[Joel Sikström]

Hello,

This RFE deprecates the `AggressiveHeap` flag in JDK 26. Please see the CSR for specific details on why this flag is being deprecated and workarounds for users interested in keeping similar behavior in the future.

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Commit messages:
 - 8370813: Deprecate AggressiveHeap

Changes: https://git.openjdk.org/jdk/pull/28144/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28144&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370813
  Stats: 16 lines in 3 files changed: 8 ins; 6 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/28144.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28144/head:pull/28144

PR: https://git.openjdk.org/jdk/pull/28144