[ci] Add generic extract_wanda_artifact tool

[andrew-anyscale]

Click CLI that extracts files matching a glob from a Wanda-cached image via crane export. Requires --wanda-image-name and --file-glob (e.g. '.whl', '.tgz'); takes --output-dir (default '.'). Errors on zero matches and on duplicate basenames across nested paths.

Topic: generic-extract
Signed-off-by: andrew andrew@anyscale.com

[andrew-anyscale]

Reviews in this chain:
└#62769 [ci] Add generic extract_wanda_artifact tool
　└#62770 [ci] Replace extract_wanda_wheels with extract_wanda_artifact

[andrew-anyscale]

#	head	base	diff	date	summary
0	d18377b5	7ea5a1aa	diff	Apr 20 8:07 AM	3 files changed, 283 insertions(+)
1	080da5aa	c33b6074	diff	Apr 20 8:26 AM	2 files changed, 16 insertions(+), 2 deletions(-)
2	3015a1d2	c33b6074	diff	Apr 20 8:43 AM	3 files changed, 37 insertions(+), 9 deletions(-)
3	952e5eda	c33b6074	diff	Apr 20 10:24 AM	4 files changed, 53 insertions(+), 49 deletions(-)

[gemini-code-assist]

Code Review

This pull request adds the extract_wanda_artifact.py script and associated tests to extract files from Wanda-cached Docker images. Feedback suggests enhancing the script by using click.Path for directory validation, adding error handling for image exports, and refining glob matching to exclude directories, thereby preventing potential runtime errors.

[cursor]

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