fix(ingest): add trailing newline to ssh keys

[hsheth2]

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). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[github-actions]

Unit Test Results (metadata ingestion)

       8 files  ±0         8 suites  ±0   57m 1s ⏱️ - 1m 37s
   707 tests ±0     704 ✔️ +1  3 💤 ±0  0 ❌  - 1 
1 414 runs  ±0  1 408 ✔️ +1  6 💤 ±0  0 ❌  - 1 

Results for commit a4bf511. ± Comparison against base commit 9384a52.

[github-actions]

Unit Test Results (build & test)

571 tests  ±0   571 ✔️ ±0   14m 12s ⏱️ ±0s
141 suites ±0       0 💤 ±0 
141 files   ±0       0 ❌ ±0 

Results for commit a4bf511. ± Comparison against base commit 9384a52.