RFR: 8326964: Remove Eclipse Shared Workspaces [v3]

[Julian Waters]

> Eclipse Shared Workspaces share the same directory as the JDK itself, which does not make much sense since there can be multiple different configurations of the JDK which Eclipse does depend on (as minimalistic as it is), and there is no one true JDK configuration, unlike what this setting suggests. This feature was created when I was much less familiar with the structure of how the JDK handles different builds, and should be removed

Julian Waters 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 five additional commits since the last revision:

 - Merge branch 'openjdk:master' into patch-15
 - Refresh documentation
 - Remove Shared Workspaces entirely
 - Remove shared targets
 - 8326964

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18046/files
  - new: https://git.openjdk.org/jdk/pull/18046/files/0d29a355..46dee2b7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18046&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18046&range=01-02

  Stats: 101532 lines in 2067 files changed: 16945 ins; 79335 del; 5252 mod
  Patch: https://git.openjdk.org/jdk/pull/18046.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18046/head:pull/18046

PR: https://git.openjdk.org/jdk/pull/18046