Summary

Remove the azure_store cloud storage extension and all associated build, CI, and test references.

Files to delete

• ext/storage_sources/azure_store/ (entire directory including tests)
• cmake/third_party/azure_sdk.cmake

Build system changes

• CMakeLists.txt:79-80 — remove the if(ENABLE_AZURE) include(cmake/third_party/azure_sdk.cmake) block
• ext/CMakeLists.txt:38-39 — remove if(ENABLE_AZURE) add_subdirectory(storage_sources/azure_store) block

Evergreen CI (test/evergreen.yml)

• Remove ENABLE_AZURE variable (~line 1585)
• Remove ${ENABLE_AZURE|} from cmake flags block (~line 324)
• Remove tasks azure-gcp-tiered-storage-extensions-test, azure-gcp-tiered-catch2-unittest-test, azure-gcp-tiered-test-small (shared with GCP — coordinate with WT for gcp_store removal)
• Remove references to those tasks from build variant tasks: lists

Python test suite

• test/suite/helper_tiered.py — remove azure_store branch in get_auth_token(), remove azure_store entry in bucket dict, remove azure_store scenario tuple, remove azure_store branch in create_bucket()