Fix MCA reservation recommendation export ingestion

[flanakin]

🛠️ Description

• Add sample MCA reservation export files
• Remove spaces from parquet column names
• Added support for multiple reservation recommendation exports
• Fixed an issue where reservation recommendations were being duplicated for the Canada Central region
• Fixed an issue where Recommendations.x_IngestionTime is not being populated in Data Explorer
• Changed a Central Canada reference to Canada Central in the Regions open data

Fixes #1317, #1322, #1323, #1324, #1325

Related to #1407

📋 Checklist

🔬 How did you test this change?

• 🤏 Lint tests
• 🤞 PS -WhatIf / az validate
• 👍 Manually deployed + verified
• 💪 Unit tests
• 🙌 Integration tests

🙋‍♀️ Do any of the following that apply?

• 🚨 This is a breaking change.
• 🤏 The change is less than 20 lines of code.

📑 Did you update docs/changelog.md?

• ✅ Updated changelog (required for dev PRs)
• ➡️ Will add log in a future PR (feature branch PRs only)
• ❎ Log not needed (small/internal change)

📖 Did you update documentation?

• ✅ Public docs in docs (required for dev)
• ✅ Internal dev docs in src (required for dev)
• ➡️ Will add docs in a future PR (feature branch PRs only)
• ❎ Docs not needed (small/internal change)