RFR: 8204681: Option to include timestamp in hprof filename

[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

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

Commit messages:
 - 8204681: Option to include timestamp in hprof filename

Changes: https://git.openjdk.org/jdk/pull/20568/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20568&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8204681
  Stats: 361 lines in 12 files changed: 273 ins; 72 del; 16 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