4.x: Adjust cache path for Scylla ccm images

[Bouncheck]

It seems that the Scylla images for ccm were not cached correctly, because in contrast to cassandra images the path to them is slightly different. The save step outputs a warning about that but it's not failing the step itself.

[Bouncheck]

For reference see
https://github.com/scylladb/java-driver/actions/runs/14538905241/job/40792830362

From download step:

 Extracting /tmp/ccm-di6t585v.tar.gz (https://s3.amazonaws.com/downloads.scylladb.com/downloads/scylla/relocatable/scylladb-2025.1/scylla-unified-2025.1.1-0.20250407.1a896169dca9.x86_64.tar.gz, /tmp/tmpagnd2443) as version release/2025.1.1 ...
Relocatable package format version 3.0 detected.
Completed to install Scylla in the folder '/home/runner/.ccm/scylla-repository/release/2025.1.1'

From save step:

Run actions/cache/save@v4
  with:
    path: ~/.ccm/repository
    key: ccm-scylla-Linux-2025.1.1
    enableCrossOsArchive: false
  env:
    JAVA_HOME: /opt/hostedtoolcache/Java_Temurin-Hotspot_jdk/8.0.442-6/x64
    JAVA_HOME_8_X64: /opt/hostedtoolcache/Java_Temurin-Hotspot_jdk/8.0.442-6/x64
    pythonLocation: /opt/hostedtoolcache/Python/3.11.12/x64
    PKG_CONFIG_PATH: /opt/hostedtoolcache/Python/3.11.12/x64/lib/pkgconfig
    Python_ROOT_DIR: /opt/hostedtoolcache/Python/3.11.12/x64
    Python2_ROOT_DIR: /opt/hostedtoolcache/Python/3.11.12/x64
    Python3_ROOT_DIR: /opt/hostedtoolcache/Python/3.11.12/x64
    LD_LIBRARY_PATH: /opt/hostedtoolcache/Python/3.11.12/x64/lib
Warning: Path Validation Error: Path(s) specified in the action for caching do(es) not exist, hence no cache is being saved.
Warning: Cache save failed.