RFR: 8341861: GHA: Use only retention mechanism to remove bundles

[Doug Simon]

There have been numerous problems in the past with the logic for removing bundles:

* [JDK-8340418](https://bugs.openjdk.org/browse/JDK-8340418)
* [JDK-8336928](https://bugs.openjdk.org/browse/JDK-8336928)
* [JDK-8338402](https://bugs.openjdk.org/browse/JDK-8338402)

These problems can be avoided by relying on the [built-in GHA mechanism for specifying a retention limit](https://docs.github.com/en/organizations/managing-organization-settings/configuring-the-retention-period-for-github-actions-artifacts-and-logs-in-your-organization) for these bundles. This PR deletes the code that eagerly removes the bundles prior to the retention limit.

An additional benefit to preserving the artifacts longer is that it increases the window for being able to download them for extra testing under different configurations than those tested by GHA (e.g. same test, different GC flags).

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Commit messages:
 - let GHA bundle artifacts be cleaned up by built-in GHA retention mechanism

Changes: https://git.openjdk.org/jdk/pull/21801/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21801&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341861
  Stats: 45 lines in 1 file changed: 0 ins; 45 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/21801.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21801/head:pull/21801

PR: https://git.openjdk.org/jdk/pull/21801