RFR: 8330587: IGV: remove ControlFlowTopComponent

[Tobias Holenstein]

The control flow window (very right, next to Bytecodes) implemented by ControlFlowTopComponent is no longer used with the availability of the new CFG view.

Therefore ControlFlowTopComponent is removed

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Commit messages:
 - JDK-8330587: IGV: remove ControlFlowTopComponent

Changes: https://git.openjdk.org/jdk/pull/18859/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18859&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330587
  Stats: 1236 lines in 16 files changed: 0 ins; 1236 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/18859.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18859/head:pull/18859

PR: https://git.openjdk.org/jdk/pull/18859