Use SCIP 10.0.2 for from-source, system, and conda CI

[mmghannam]

Follow-up to #40 (which moved the bundled feature to SCIP 10). This moves the remaining CI jobs off SCIP 9.2.4:

• from-source: from_source.rs now downloads the official scipoptsuite-10.0.2.tgz. Since it's a tarball (no source zip is published for v10), download.rs gains a download_and_extract_tar_gz helper (new optional flate2/tar build-deps, gated behind the from-source feature).
• linux-system: installs the SCIP 10.0.2 Debian package. The v10 asset naming changed (scipoptsuite_10.0.2-1+jammy_amd64.deb, tag v10.0.2 with dots), so the download URL is updated accordingly.
• conda: pins scip=10.0.2 (was unpinned, silently tracking conda-forge latest).

Verified locally: cargo build --features from-source builds SCIP 10 from source and cargo test --features from-source --tests passes.