RFR: 8367259: Clean up make/scripts and bin directory

[Erik Joelsson]

On Tue, 9 Sep 2025 13:55:41 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> Over time, cruft have accumulated in terms of scripts that are no longer relevant. These should be removed. Also, scripts that are not used as part of the build process, but run by JDK developers from time to time, should reside in `bin` instead of `make/scripts`.
> 
> I have also updated `generate-symbol-data.sh` and `update_pch.sh` so they work regardless of current dir.

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27172#pullrequestreview-3202554210