RFR: 8319306: Serial: Remove TenuredSpace::verify

[Albert Mingkun Yang]

I didn't find the BOT verification logic much useful while working on JDK-8318647, so I propose removing it to simplify the code.

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Commit messages:
 - s1-remove-verify

Changes: https://git.openjdk.org/jdk/pull/16471/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16471&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319306
  Stats: 48 lines in 2 files changed: 0 ins; 47 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16471.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16471/head:pull/16471

PR: https://git.openjdk.org/jdk/pull/16471