[Doc] update versions after plugin 2602 release [skip ci]

[nvliyuan]

The PR is to update the plugin version to latest v26.02.0
Signed-off-by: liyuan yuali@nvidia.com

[greptile-apps]

Greptile Summary

This PR performs a straightforward version bump of the RAPIDS Accelerator for Apache Spark plugin from v25.12.0 to v26.02.0 across 23 documentation, notebook, script, and configuration files. No logic, code behavior, or architecture changes are involved.

• All references to rapids-4-spark_2.12-25.12.0 jars, Maven URLs, and version strings updated to 26.02.0 consistently across docs, notebooks, shell scripts, pom.xml, and Docker Compose files
• Copyright years updated from 2025 to 2025-2026 in 4 modified shell/YAML files
• RAPIDS conda packages (cudf, cuml) version references updated from 25.12 to 26.02 in the Optuna-Spark README
• No remaining references to the old version 25.12 were found in the repository after this change, confirming completeness

Confidence Score: 5/5

• This PR is safe to merge — it contains only version string updates in documentation, notebooks, scripts, and build configuration with no logic changes.
• All 23 files contain only mechanical find-and-replace version bumps from 25.12.0 to 26.02.0. No code logic, behavior, or architecture is modified. A grep confirmed no stale 25.12 references remain in the repository, confirming the update is complete and consistent.
• No files require special attention. The pom.xml change updates a Maven dependency version which could affect builds, but it is consistent with the release intent.

Important Files Changed

Filename	Overview
docs/get-started/xgboost-examples/csp/databricks/init.sh	Version bump from 25.12.0 to 26.02.0 in rapids jar download URL, and copyright year updated to 2025-2026.
examples/ML+DL-Examples/Optuna-Spark/README.md	Version bump from 25.12 to 26.02 in conda environment name and cudf/cuml package versions.
examples/ML+DL-Examples/Optuna-Spark/optuna-examples/databricks/init_optuna.sh	Version bump from 25.12.0 to 26.02.0 for SPARK_RAPIDS_VERSION, copyright year updated.
examples/SQL+DF-Examples/tpcds/notebooks/TPCDS-SF10.ipynb	Version bump from 25.12.0 to 26.02.0 for rapids_version variable in notebook.
examples/UDF-Examples/RAPIDS-accelerated-UDFs/pom.xml	Version bump from 25.12.0 to 26.02.0 for rapids4spark.version Maven property.
examples/spark-connect-gpu/server/docker-compose.yaml	Version bump from 25.12.0 to 26.02.0 for RAPIDS_VERSION default in Docker Compose build args, copyright year updated.
tools/databricks/README.md	Version bump from 25.12.0 to 26.02.0 for latest tools version supported.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Version Bump: 25.12.0 → 26.02.0] --> B[Documentation Files]
    A --> C[Notebook Files]
    A --> D[Shell Scripts]
    A --> E[Build Configuration]

    B --> B1[databricks.md]
    B --> B2[preparation-python.md]
    B --> B3[preparation-scala.md]
    B --> B4[UDF README.md]
    B --> B5[PCA README.md]
    B --> B6[tpcds README.md]
    B --> B7[spark-connect README.md]
    B --> B8[Optuna README.md]
    B --> B9[databricks tools README.md]

    C --> C1[MortgageETL.ipynb]
    C --> C2[taxi-ETL.ipynb python/scala]
    C --> C3[mortgage-ETL.ipynb]
    C --> C4[TPCDS-SF10.ipynb]
    C --> C5[micro-benchmarks-gpu.ipynb]
    C --> C6[pca.ipynb]
    C --> C7[optuna-dataframe.ipynb]

    D --> D1[init.sh - databricks]
    D --> D2[init_optuna.sh]
    D --> D3[start_cluster.sh]
    D --> D4[extract-cudf-libs.sh]

    E --> E1[pom.xml - rapids4spark.version]
    E --> E2[docker-compose.yaml - RAPIDS_VERSION]

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