[CI] Add filter_release_build_yaml to trim build steps by test needs

[andrew-anyscale]

Add collect_needed_variants() to extract python versions, image types, and CUDA platforms from selected tests. Add filter_release_build_yaml() to rewrite build.rayci.yml in-place, removing steps for unneeded image types and trimming array dimensions (python, platform, cuda) and adjustments to only needed values. Steps left with no viable combinations are removed entirely.

This is the library/logic layer — the init script integration comes in the next commit.

Topic: release-build-filter
Relative: array-release
Labels: draft
Signed-off-by: andrew andrew@anyscale.com

[andrew-anyscale]

Reviews in this chain:
└#62201 [CI] Convert _images.rayci.yml from matrix to array syntax
　└#62202 [CI] Convert _wheel-build.rayci.yml from matrix to array syntax
　　└#62274 [CI] Rename cuda dimension to platform in anyscale CUDA build steps
　　　└#62305 [CI] Add build_short_platform_map and array key helpers
　　　　└#62273 [CI] Convert release/build.rayci.yml to array + update get_prerequisite_step
　　　　　└#62292 [CI] Add filter_release_build_yaml to trim build steps by test needs
　　　　　　└#62293 [CI] Wire up build.rayci.yml filtering in release init script

[andrew-anyscale]

#	head	base	diff	date	summary
0	06274d1e	b3d5a182	diff	Apr 1 16:22 PM	2 files changed, 467 insertions(+), 1 deletion(-)
1	50071b56	b3d5a182	diff	Apr 1 17:18 PM	2 files changed, 202 insertions(+), 9 deletions(-)
2	c6e4a1d8	fea08d8a	rebase	Apr 2 8:11 AM	0 files changed
3	64db7af9	95a84512	rebase	Apr 2 8:18 AM	0 files changed
4	0be97456	4fbf70ff	rebase	Apr 2 8:23 AM	0 files changed
5	0aab2cda	6a82f611	rebase	Apr 2 8:28 AM	0 files changed
6	b2a71bad	a1adc68e	rebase	Apr 2 8:33 AM	0 files changed
7	18fd7b0e	a1adc68e	diff	Apr 2 8:42 AM	1 file changed, 13 insertions(+), 12 deletions(-)
8	230d4549	4e8ebb1a	rebase	Apr 2 12:52 PM	0 files changed
9	920c5ebf	3bdbf6e5	rebase	Apr 2 19:33 PM	0 files changed

[gemini-code-assist]

Code Review

This pull request adds functionality to filter build.rayci.yml files, retaining only the Python versions, image types, and CUDA platforms required by selected tests. It introduces several helper functions and comprehensive unit tests. The review feedback suggests optimizing the filtering logic by using the _filter_array_dimension helper and removing a redundant conditional check.