refactor(ingest): add ALL_ENV_TYPES constant

[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   59m 44s ⏱️ + 3m 5s
   683 tests ±0     680 ✔️ ±0  3 💤 ±0  0 ❌ ±0 
1 366 runs  ±0  1 360 ✔️ ±0  6 💤 ±0  0 ❌ ±0 

Results for commit 851ef5e. ± Comparison against base commit 6f09f10.

[github-actions]

Unit Test Results (build & test)

521 tests  ±0   521 ✔️ ±0   14m 13s ⏱️ -35s
122 suites ±0       0 💤 ±0 
122 files   ±0       0 ❌ ±0 

Results for commit 851ef5e. ± Comparison against base commit 6f09f10.

[shirshanka]

LGTM