refactor: openai completions message creation

[teamdandelion]

Similar to the corresponding change to responses, we make sure that openai user messages combine related content into the same message where possible

[teamdandelion]

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• feat: openai:responses audio raises FeatureNotSupportedError #1460
• feat: add openai completions audio support #1459
• feat: audio support for google #1458
• feat: Anthropic raises FeatureNotSupportedError for audio inputs #1457
• test: scaffold audio testing #1453
• feat: implement llm.Audio #1452
• refactor: download static assets for content tests #1456
• feat: implement image recognition for openai:completions #1448
• refactor: openai completions message creation #1451 👈 (View in Graphite)
• feat: add image recognition for openai:responses #1447
• refactor: openai:responses message construction logic #1450
• feat: add image recognition for Google #1446
• feat: add image recognition support for anthropic #1445
• refactor: make model_id optional on FeatureNotSupportedError #1449
• test: prepare e2e test for image recognition #1444
• feat: implement llm.Image #1443
• test: DRY repeated logic in snapshot tests #1442
• test: refactor all e2e tests to catch exceptions #1440
• v2

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Merge activity

• Oct 27, 5:58 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Oct 27, 5:59 PM UTC: Graphite couldn't merge this pull request because a downstack PR refactor: openai:responses message construction logic #1450 failed to merge.
• Oct 27, 8:38 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Oct 27, 8:39 PM UTC: Graphite couldn't merge this pull request because a downstack PR refactor: openai:responses message construction logic #1450 failed to merge.