ci: Add 'prompts' to allowed semantic PR title types

[Aaron ("AJ") Steers (aaronsteers)]

ci: Add 'prompts' to allowed semantic PR title types

Summary

Adds prompts (and Prompts for case-insensitive consistency with existing types) to the allowed semantic PR title types in semantic_pr_check.yml.

This is part of a cross-repo rollout adding a new prompts type for PRs that change AI/LLM prompts, agent instructions, playbooks, or skill definitions — content that doesn't fit neatly into docs, ci, feat, or fix. The skill definition update is tracked in airbytehq/ai-skills#79.

Review & Testing Checklist for Human

• Verify that prompts and Prompts are correctly placed in the YAML types list (proper indentation, no trailing whitespace)

Notes

• Purely additive change — no existing types removed or modified
• Companion PRs are being opened across ~9 other Airbyte repos with the same change
• Requested by: Aaron ("AJ") Steers (@aaronsteers)
• Devin session

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# Run the CLI from this branch:
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PyTest Results (Fast)

3 892 tests  ±0   3 880 ✅ ±0   6m 47s ⏱️ -1s
    1 suites ±0      12 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit 8c0b2dd. ± Comparison against base commit f550424.