chore: improve convert-template error messages

[benlife5]

Improves some error messaging if the template conversion fails.

Will also update the docs at https://yext.atlassian.net/wiki/spaces/eng/pages/1466597451 for templates

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository UI
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• Plan: Advanced
• Run ID: 06c4e39b-d38a-47b7-a3d1-dea22d87cdf9

📥 Commits

Reviewing files that changed from the base of the PR and between 4c8711f and d29389d.

📒 Files selected for processing (2)

• packages/visual-editor/src/cli/commands/internal/convertTemplatesToSectionLibrary.test.ts
• packages/visual-editor/src/cli/commands/internal/convertTemplatesToSectionLibrary.ts

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Walkthrough

Template conversion now reports paths and field-specific details for invalid template identifiers, metadata, and layout structures. It also identifies normalized-ID collisions, reserved IDs, and conflicts with generated layout IDs. Metadata-list errors distinguish non-array values from unsupported entries. New tests cover these diagnostics.

Suggested reviewers: briantstephan

Priority: ⬇️ Low

Change: Other

Merge Risk: ⚪ Minimal · up to d2938

No actionable issue is established; the change is mergeable after normal checks.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the changeset’s main purpose: improving template conversion error messages.
Description check	✅ Passed	The description identifies improved error messages for template conversion, which matches the changeset.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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