RFR: 8279913: obsolete ExtendedDTraceProbes

[Emanuel Peter]

Obsoleted ExtendedDTraceProbes.
Removed all uses of the flag, it now shows this warning when used:
`Ignoring option ExtendedDTraceProbes; support was removed in 20.0`

Documentation was already changed in [JDK-8279047](https://bugs.openjdk.org/browse/JDK-8279047)

Verified warning message in dtrace build, and regular build.
Ran automatic regression tests.

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Commit messages:
 - remove flag from a test
 - 8279913: obsolete ExtendedDTraceProbes

Changes: https://git.openjdk.org/jdk/pull/10930/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10930&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8279913
  Stats: 39 lines in 5 files changed: 0 ins; 34 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/10930.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10930/head:pull/10930

PR: https://git.openjdk.org/jdk/pull/10930