RFR: 8374507: GHA: Limit debug symbols generation to conserve disk space

[Aleksey Shipilev]

I have noticed that Linux x86_64 fastdebug build jobs started to fail in GHA with no free space left on device. Instrumenting GHA runs shows we have about 17G of free space on those runners. 


Filesystem  Size  Used  Avail Use% Mounted on
/dev/root    72G   56G   17G   78% /


[GHA docs](https://docs.github.com/en/actions/reference/runners/github-hosted-runners#standard-github-hosted-runners-for-public-repositories) say there is 14G of guaranteed disk space on runners. This is a bit beyond what our fastdebug builds need. My local build says disabling debug symbols bundling reduces the space requirement from 16G -> 11G, without regressing tests.

Testing:
 - [x] Ad-hoc JVM crash to verify that stack trace generation still works
 - [ ] GHA

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

Commit messages:
 - Try external-symbols-in-bundles=none
 - Handle the absence of symbols gracefully
 - Fix

Changes: https://git.openjdk.org/jdk/pull/29030/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29030&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374507
  Stats: 5 lines in 5 files changed: 5 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/29030.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29030/head:pull/29030

PR: https://git.openjdk.org/jdk/pull/29030