RFR: 8377143: Parallel: Remove special treatment in JstatGcCapacityResults.java [v2]

[Albert Mingkun Yang]

> Remove the `if (isTenuredParallelGC) {` path in `JstatGcCapacityResults.java` because ParallelGC ensures `NGC == S0C + S1C + EC` like other GCs nowadays.
> 
> Test: tier1-5

Albert Mingkun Yang 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 three additional commits since the last revision:

 - copyright
 - Merge branch 'master' into pgc-svc-remove-if-check
 - pgc-svc-remove-if-check

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/29562/files
  - new: https://git.openjdk.org/jdk/pull/29562/files/4da63a0b..1d891f3e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29562&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29562&range=00-01

  Stats: 12360 lines in 357 files changed: 6714 ins; 2181 del; 3465 mod
  Patch: https://git.openjdk.org/jdk/pull/29562.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29562/head:pull/29562

PR: https://git.openjdk.org/jdk/pull/29562