Replace SNAPSHOT_INTERNAL secrets with tokenless-OIDC authentication [DI-706] (#792)

See 
-
https://docs.github.com/en/actions/how-tos/secure-your-work/security-harden-deployments/oidc-in-aws
-
[ADR](https://hazelcast.atlassian.net/wiki/spaces/EN/pages/6645022721/ADR-00089-+Type+2+-Migrate+GitHub+Actions+to+use+tokenless+OIDC+authentication)
- [reference `hazelcast-docker`
implementation](hazelcast/hazelcast-docker#1197)

Fixes: [DI-706](https://hazelcast.atlassian.net/browse/DI-706)

[DI-706]:
https://hazelcast.atlassian.net/browse/DI-706?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Author: JackPGreen

.github/workflows/nightly_runner.yml

@@ -43,10 +43,15 @@ jobs:
         with:
           secret-ids: |
             HAZELCAST_ENTERPRISE_KEY,CN/HZ_LICENSE_KEY
+      - uses: hazelcast/docker-actions/get-jfrog-credentials@master
+        id: jfrog
+        with:
+          aws-role-to-assume: ${{ secrets.AWS_HAZELCAST_OIDC_GITHUB_ACTIONS_ROLE_ARN }}
+          jfrog-oidc-provider-name: ${{ github.repository_owner }}-snapshot-internal
       - name: Run tests
         env:
-          HZ_SNAPSHOT_INTERNAL_USERNAME: ${{ secrets.HZ_SNAPSHOT_INTERNAL_USERNAME }}
-          HZ_SNAPSHOT_INTERNAL_PASSWORD: ${{ secrets.HZ_SNAPSHOT_INTERNAL_PASSWORD }}
+          HZ_SNAPSHOT_INTERNAL_USERNAME: ${{ steps.jfrog.outputs.user }}
+          HZ_SNAPSHOT_INTERNAL_PASSWORD: ${{ steps.jfrog.outputs.token }}
         run: python run_tests.py
       - name: Upload remote controller logs on test failure
         uses: actions/upload-artifact@v4