RFR: 8347067: Load certificates without explicit trust settings in KeyChainStore

[Tim Jacomb]

## The change

Without this change intermediate certificates that don't have explicit trust settings are ignored not added to the truststore.



## Reproducer

See https://github.com/timja/openjdk-intermediate-ca-reproducer

Without this change the reproducer fails, and with this change it succeeds.

## Example failing architecture

Root CA -> Intermediate 1 -> Intermediate 2 -> Leaf

Where:
* All certs are in admin domain kSecTrustSettingsDomainAdmin
* Root CA is marked as always trust
* Intermediate 1 and 2 are Unspecified

Previously Root CA would be found but intermediate 1 and 2 would be skipped when verifying trust settings.

## Background reading

### Rust
see also Rust Lib that is used throughout Rust ecosystem for this: 
https://github.com/rustls/rustls-native-certs/blob/efe7b1d77bf6080851486535664d1dc7ef0dea68/src/macos.rs#L39-L58

e.g. in Deno `https://github.com/denoland/deno/pull/11491` where I've verified it is correctly implemented and works in my setup

## Python

I also looked at the Python implementation for inspiration as well (which also works on my system): https://github.com/sethmlarson/truststore/blob/main/src/truststore/_macos.py

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Commit messages:
 - Executable files are not allowed...
 - Flag test as manual
 - Minor cleanups
 - Add new line
 - Add jtreg test
 - Release subjCerts
 - Revert unneeded changes
 - Merge branch 'master' into load-anchor-and-user-certificates-keychainstore
 - Verify certificate without trustsettings before adding
 - Tweeks to make the basic case work
 - ... and 1 more: https://git.openjdk.org/jdk/compare/f1d85ab3...2d955702

Changes: https://git.openjdk.org/jdk/pull/22911/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22911&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347067
  Stats: 299 lines in 8 files changed: 287 ins; 6 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/22911.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22911/head:pull/22911

PR: https://git.openjdk.org/jdk/pull/22911