RFR: 8343893: Test jdk/jfr/event/runtime/TestNativeMemoryUsageEvents.java failed: heap should have grown and NMT should show that: expected 0 > 0

[Johan Sjölen]

# Background

With the implementation of [JDK-8312132](https://bugs.openjdk.org/browse/JDK-8312132) we added the `MemoryFileTracker` (MFT). Unfortunately, this work failed to implement JFR integration. This, in turn, meant that (generational) ZGC has not correctly reported its heap usage via the NMT JFR events. We (as in Oracle) never saw this issue in testing, as we didn't run this test for all possible GC configurations. With an update of our test configurations this is no longer the case: We run this test for all possible GCs and the test now fails for generational ZGC.

# The fix

I implemented JFR events for the MFT by adding all of its reserved and committed memory into the JFR data, similarly to the `VirtualMemoryTracker`. I also added an explicit `run` using `ZGC` to the failing test, to ensure that any actual regressions are found.

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Commit messages:
 - Add MemoryFileTracker support to NMTUsage

Changes: https://git.openjdk.org/jdk/pull/22204/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22204&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343893
  Stats: 40 lines in 5 files changed: 31 ins; 4 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/22204.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22204/head:pull/22204

PR: https://git.openjdk.org/jdk/pull/22204