RFR: 8348349: Refactor CDSConfig::is_dumping_heap() [v2]

[Ioi Lam]

> Please review this small clean up:
> 
> `HeapShared::can_write()` and `CDSConfig::is_dumping_heap()` are both for deciding whether CDS should dump heap objects. I removed the former and consolidated all the logic to the latter.
> 
> I also updated the logging message in case heap objects cannot be dumped.
> 
> I also updated VMProps to clarify what `vmCDSCanWriteArchivedJavaHeap()` means.

Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:

  @matias9927 comment

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/23249/files
  - new: https://git.openjdk.org/jdk/pull/23249/files/5993ef74..a6a77ca7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23249&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23249&range=00-01

  Stats: 10 lines in 1 file changed: 0 ins; 7 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/23249.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23249/head:pull/23249

PR: https://git.openjdk.org/jdk/pull/23249