chore(ingest): add vulture config and remove some dead code

[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  +       8         8 suites  +8   59m 51s ⏱️ + 59m 51s
   655 tests +   655     652 ✔️ +   652  3 💤 +3  0 ❌ ±0 
1 310 runs  +1 310  1 304 ✔️ +1 304  6 💤 +6  0 ❌ ±0 

Results for commit 93c03d4. ± Comparison against base commit fa0fd7b.

♻️ This comment has been updated with latest results.

[github-actions]

Unit Test Results (build & test)

504 tests   504 ✔️  8m 10s ⏱️
117 suites      0 💤
117 files        0 ❌

Results for commit 93c03d4.

♻️ This comment has been updated with latest results.

[shirshanka]

Waiting to approve until we get confirmations from the authors (@mayurinehate , @rslanka ) that these classes are safe to remove or whether they missed adding a dependency on them.

[shirshanka]

LGTM