RFR: 8298277: Replace "session" with "scope" for FFM access

[Per Minborg]

This PR suggests renaming various names from "session" to "scope" in accordance with https://openjdk.org/jeps/434

The PRs contains changes for several sub-components.

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

Commit messages:
 - Rename session to scope

Changes: https://git.openjdk.org/jdk/pull/11573/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11573&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298277
  Stats: 2783 lines in 98 files changed: 954 ins; 955 del; 874 mod
  Patch: https://git.openjdk.org/jdk/pull/11573.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11573/head:pull/11573

PR: https://git.openjdk.org/jdk/pull/11573