RFR: 8315848: G1: Rename rs_ prefix to card_rs in analytics

[Thomas Schatzl]

Hi all,

  please review this renames of (card set) remembered set prediction related identifiers from just `rs_` to `card_rs` to (I believe) improve readability and reduce possible confusion.

Testing: gha, tier1,2

Thanks,
  Thomas

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Commit messages:
 - 8315848-renamie-rs-prefix-to-card-rs

Changes: https://git.openjdk.org/jdk/pull/15812/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15812&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315848
  Stats: 57 lines in 6 files changed: 0 ins; 2 del; 55 mod
  Patch: https://git.openjdk.org/jdk/pull/15812.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15812/head:pull/15812

PR: https://git.openjdk.org/jdk/pull/15812