[jdk8u-dev] RFR: 8342841: [8u] Separate jdk_security_infra tests from jdk_tier1

[Zdenek Zambersky]

After [JDK-8315757](https://bugs.openjdk.org/browse/JDK-8315757),  `jdk_security_infra` is included in `jdk_tier1` (jdk 8 only). I would like to exclude it from `jdk_tier1` and instead add new configurations to GHA workflow.

**Motivations:**
- `jdk_security_infra` has not proven to be very stable/reliable set of tests.
- being able to quickly distinguish `jdk_security_infra` test failures from other tests failures in results would be helpful
- tests in `jdk_security_infra` are created to work with internal cacerts, but vendors usually replace cacerts with their own (e.g. [temurin](https://github.com/adoptium/temurin-build/commit/9cb3ddcb8f3550aa904f086146be0cdd242d7e8a)). It then complicates running `jdk_tier1` group on jdk with custom cacerts (needs custom excludes etc..).
- jdk 8 is currently only jdk including `jdk_security_infra` in `jdk_tier1`

**Testing:**
GHA: OK (all test failures should be unrelated to this change)

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Commit messages:
 - Run jdk_security_infra separatelly from jdk_tier1

Changes: https://git.openjdk.org/jdk8u-dev/pull/596/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=596&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342841
  Stats: 17 lines in 2 files changed: 15 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/596.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/596/head:pull/596

PR: https://git.openjdk.org/jdk8u-dev/pull/596