Cleanup documentdb dependency and code references

Changes

• exclude unused documentdb-bulkexecutor dependency
• cleanup the associated code w.r.t documentdb-bulkexecutor

Dev Checklist:

• Existing Tests pass
• Verified functionality locally
• Self Reviewed code for references/call usages of documentdb-bulkexecutor before cleanup. Only Storage service references found, yet it was dead-code methods & no usages inside any API-services call flow.
• used inspect unused code usages in IntelliJ IDE