RFR: 8326964: Remove Eclipse Shared Workspaces [v5]

[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 incrementally with one additional commit since the last revision:

  Remove SHARED definition in Main.gmk

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18046/files
  - new: https://git.openjdk.org/jdk/pull/18046/files/212fc3c1..4287082a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18046&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18046&range=03-04

  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 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