refactor(ingest): move common host_port validation

[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   1h 1m 55s ⏱️ + 2m 47s
   717 tests ±0     714 ✔️ ±0  3 💤 ±0  0 ❌ ±0 
1 436 runs  ±0  1 430 ✔️ ±0  6 💤 ±0  0 ❌ ±0 

Results for commit 63f6055. ± Comparison against base commit 68db859.

♻️ This comment has been updated with latest results.

[github-actions]

Unit Test Results (build & test)

562 tests  ±0   562 ✔️ ±0   13m 19s ⏱️ +22s
139 suites ±0       0 💤 ±0 
139 files   ±0       0 ❌ ±0 

Results for commit 63f6055. ± Comparison against base commit 68db859.

♻️ This comment has been updated with latest results.

[rslanka]

LGTM!