fix(dataPlatformInstance): add data platform instance to entity registry

[RyanHolstien]

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Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable)

[github-actions]

Unit Test Results (build & test)

  96 files  ±0    96 suites  ±0   11m 25s ⏱️ - 1m 47s
686 tests ±0  627 ✔️ ±0  59 💤 ±0  0 ❌ ±0 

Results for commit a9baf8b. ± Comparison against base commit bdf17f5.

[github-actions]

Unit Test Results (metadata ingestion)

       5 files  ±0         5 suites  ±0   1h 5m 1s ⏱️ + 2m 15s
   392 tests ±0     392 ✔️ ±0    0 💤 ±0  0 ❌ ±0 
1 804 runs  ±0  1 773 ✔️ +7  31 💤  - 7  0 ❌ ±0 

Results for commit a9baf8b. ± Comparison against base commit bdf17f5.