Use standard .yml filenames for publication entries

[Copilot]

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PR #2982 adds three new publication records, but the files were introduced with .yaml names instead of the repository’s standard .yml convention. This update adds the same publication metadata under the expected filenames so the publication entries are handled consistently by the site data workflow.

• Changes

  • Added the publication records as:
    • _data/publications/2901419.yml
    • _data/publications/3150536.yml
    • _data/publications/3168546.yml
  • Kept the publication metadata identical to the original PR content.

• Scope

  • No content changes to the publication records themselves.
  • Aligns the new entries with the repository’s existing publication file naming pattern.

• Example

  inspire-id: 2901419
  focus-area: ia
  comment: "Published in Computing and Software for Big Science, V2.0"