fix: resolve silent process exit when deploying 3+ organizations with discovery domains

[ankita10119]

When a tenant configuration includes 3 or more organizations that each have discovery_domains, running a0deploy import silently exits mid-run without error. No discovery domains are created or updated, and the "Import Successful" message never appears.

This affects both first-time deploys (create path) and subsequent deploys (update path). The process exits after the delete-warning phase, before any organization changes are applied.

🔧 Changes

• organizations.ts: Discovery domain create/update/delete operations no longer route through the shared request pool. They now use Promise.all and direct API calls, consistent with how connections and client_grants sub-operations are handled in the same handler.
• connections.ts: Fixed a crash at module load time when ConnectionDpopSigningAlgEnum is not present in the installed auth0 SDK version. The schema validation for dpop_signing_alg now gracefully omits the enum constraint when the SDK does not provide it.

Backward Compatibility

No breaking changes. Behavior is identical for:

• Tenants with fewer than 3 organizations with discovery domains (the deadlock condition was never triggered).
• Tenants without the Organization Discovery Domains feature enabled.
• All other resource types — only the discovery domain sub-operations inside OrganizationsHandler are affected.

📚 References

🔬 Testing

• Added a regression test that reproduces the deadlock condition directly
• Tested with real tenant data as well

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.09%. Comparing base (8fe0e28) to head (e5de6de).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1354      +/-   ##
==========================================
- Coverage   80.10%   80.09%   -0.01%     
==========================================
  Files         152      152              
  Lines        6212     6209       -3     
  Branches     1290     1290              
==========================================
- Hits         4976     4973       -3     
  Misses        702      702              
  Partials      534      534              

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