Valve Landmark Bundle: Update to fix changes to EnsureChannelFirstd and further documentation

[ericspod]

Description

This fixes a discovered issue with the way transforms are used and adds a little more clarification to the documentation.

Status

Work in progress

Please ensure all the checkboxes:

• [x] Codeformat tests passed locally by running ./runtests.sh --codeformat.
• [ ] In-line docstrings updated.
• [x] Update version and changelog in metadata.json if changing an existing bundle.
• [x] Please ensure the naming rules in config files meet our requirements (please refer to: CONTRIBUTING.md).
• [x] Ensure versions of packages such as monai, pytorch and numpy are correct in metadata.json.
• [x] Descriptions should be consistent with the content, such as eval_metrics of the provided weights and TorchScript modules.
• [x] Files larger than 25MB are excluded and replaced by providing download links in large_file.yml.
• [x] Avoid using path that contains personal information within config files (such as use /home/your_name/ for "bundle_root").

[yiheng-wang-nv]

/build

[yiheng-wang-nv]

CI test failed because of the numpy version. I checked th numpy 1.26 requirements and it needs to run with Python >= 3.9 but now we use python 3.8 Hi @ericspod , do you think if we can use an elder numpy version for this bundle so far? It seems MONAI supported python versions is 3.8+ (https://raw.githubusercontent.com/Project-MONAI/MONAI/dev/docs/images/python.svg)

If numpy 1.26 is necessary, it may need @YanxuanLiu 's help to modify the python used for blossom CI and then we can rerun the test for this PR.

[ericspod]

Any version of Numpy that's recent should be fine actually so I've changed it to be 1.25.2.

[yiheng-wang-nv]

/build