[Excel] Add samples for Workbook, conditional formatting interfaces, and card layout types

[alison-mk]

This PR:

• Maps an existing snippet to the top-level Workbook article
• Maps existing snippets to two conditional formatting interfaces
• Updates the data types entity attribution snippet to include two more card layout interfaces

[Copilot]

Pull request overview

This PR maps existing Office.js snippets to Excel API documentation and enhances the entity attribution sample to demonstrate additional card layout types (two-column and table layouts).

Changes:

• Added snippet mappings for Excel.Workbook class and two conditional formatting interfaces (ConditionalColorScaleCriteria and ConditionalColorScaleCriterion)
• Enhanced the entity attribution sample to include CardLayoutTableSection and CardLayoutTwoColumnSection layout types
• Updated sample metadata, descriptions, and API version from 1.16 to 1.19

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
snippet-extractor-output/snippets.yaml	Added 3 new snippet mappings (Workbook, ConditionalColorScaleCriteria, ConditionalColorScaleCriterion, CardLayoutTableSection, CardLayoutTwoColumnSection) and updated 4 existing snippets with new layout types and properties
samples/excel/20-data-types/data-types-entity-attribution.yaml	Enhanced sample with new stock information properties, added two-column and table layout sections, improved descriptions and comments, updated API version to 1.19
playlists/excel.yaml	Updated metadata for entity attribution sample to reflect new description and API version
playlists-prod/excel.yaml	Updated metadata for entity attribution sample to reflect new description and API version
snippet-extractor-metadata/excel.xlsx	Binary file updated (likely regenerated output based on snippet changes)

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