fix(ingest): use default telemetry ID when config is unwritable

[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 15m 40s ⏱️ + 2m 29s
   645 tests ±0     642 ✔️ ±0    3 💤 ±0  0 ❌ ±0 
1 228 runs  ±0  1 178 ✔️ ±0  50 💤 ±0  0 ❌ ±0 

Results for commit 502129e. ± Comparison against base commit 34c2f94.

[github-actions]

Unit Test Results (build & test)

499 tests  ±0   499 ✔️ ±0   9m 32s ⏱️ + 1m 4s
115 suites ±0       0 💤 ±0 
115 files   ±0       0 ❌ ±0 

Results for commit 502129e. ± Comparison against base commit 34c2f94.

[shirshanka]

LGTM