RFR: 8204681: Option to include timestamp in hprof filename [v2]

[Sonia Zaldana Calles]

> Hi all, 
> 
> This PR addresses [8204681](https://bugs.openjdk.org/browse/JDK-8204681) enabling support for timestamp expansion in filenames specified in `-XX:HeapDumpPath` using `%t`. 
> 
> As mentioned in this comments for this issue, this is somewhat related to [8334492](https://bugs.openjdk.org/browse/JDK-8334492) where we enabled support for `%p` for filenames specified in jcmd. 
> 
> With this patch, I propose: 
> - Expanding the utility function `Arguments::copy_expand_pid` to `Arguments::copy_expand_arguments` to deal with `%p` expansions for pid and `%t` expansions for timestamps. 
> - Leveraging the above utility function to enable argument expansion for both heap dump filenames and jcmd output commands. 
> - Though the linked JBS issue only relates to heap dumps generated in case of OOM, I think we can edit it to more broadly support filename expansion to support `%t` for jcmd as well. 
> 
> Testing: 
> - [x] Added test cases pass with all platforms (verified with a GHA job). 
> - [x] Tier 1 passes with GHA. 
> 
> Looking forward to hearing your thoughts!
> 
> Thanks, 
> Sonia

Sonia Zaldana Calles has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into JDK-8204681
 - 8204681: Option to include timestamp in hprof filename

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/20568/files
  - new: https://git.openjdk.org/jdk/pull/20568/files/c550c9fd..165a77b4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20568&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20568&range=00-01

  Stats: 44121 lines in 1412 files changed: 27993 ins; 8898 del; 7230 mod
  Patch: https://git.openjdk.org/jdk/pull/20568.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20568/head:pull/20568

PR: https://git.openjdk.org/jdk/pull/20568