RFR: 8345259: Disallow ALL-MODULE-PATH without explicit --module-path [v6]

[Severin Gehwolf]

> Please review this extension to #22609 which now disallows `ALL-MODULE-PATH` without explicit `--module-path` option or a non-existent module path. In addition, this fixes a bug mentioned in #22609 when `ALL-MODULE-PATH` and `--limit-modules` are used in combination. It failed earlier and passes now due to alignment of `ModuleFinder`s. With this patch JEP 493 enabled builds and regular JDK builds behave the same in terms of `ALL-MODULE-PATH`.
> 
> When an explicit module path is being added, there is no difference. All modules on that path will be added as roots. Tests have been added for the various cases and existing tests updated to allow for them to run on JEP 493 enabled builds. Thoughts?
> 
> Testing:
> - [x] GHA, `test/jdk/tools/jlink` (all pass)
> - [x] Added jlink test.

Severin Gehwolf has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 20 commits:

 - More test clean-ups
 - Merge two AllModulePath tests
 - Better error message with no modules on mod-path and ALL-MODULE-PATH
 - Merge branch 'jdk-8345573-runtime-link-limit-mods' into jdk-8345259-all-module-path-fix
 - Mandy's feedback
 - Merge branch 'jdk-8345573-runtime-link-limit-mods' into jdk-8345259-all-module-path-fix
 - Handle non-existent module-path with ALL-MODULE-PATH
 - Move test, more test fixes for JEP 493 enabled builds
 - Fix JLinkTest.java
 - 8345259: Disallow ALL-MODULE-PATH without explicit --module-path
 - ... and 10 more: https://git.openjdk.org/jdk/compare/c9643d31...9ba004cc

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Changes: https://git.openjdk.org/jdk/pull/22494/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22494&range=05
  Stats: 294 lines in 5 files changed: 225 ins; 39 del; 30 mod
  Patch: https://git.openjdk.org/jdk/pull/22494.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22494/head:pull/22494

PR: https://git.openjdk.org/jdk/pull/22494