Remove download-boundaries-database-from-B2 code

Downloading from artifact of GitHub Actions workflow runs is our way
forward for development test builds and future nightly CI tests.

python/add_data.sh

@@ -527,27 +527,6 @@ import_census_boundaries() {
       cat opendrr-boundaries.sql.[0-9][0-9] > opendrr-boundaries.sql
     fi
 
-  elif [[ "${ADD_DATA_B2_OVER_ARTIFACT,,}" =~ ^(true|1|y|yes|on)$ ]]; then
-    INFO "... from B2, branch ${boundaries_branch}..."
-
-    # TODO: Simplify the code below
-    RUN curl -O --retry 999 --retry-max-time 0 \
-        "https://opendrr.eccp.ca/file/OpenDRR/opendrr-boundaries-${boundaries_branch}.sql" || \
-      RUN curl -O --retry 999 --retry-max-time 0 \
-          "https://opendrr.eccp.ca/file/OpenDRR/opendrr-boundaries-${boundaries_branch}.sql" || \
-      RUN curl -O --retry 999 --retry-max-time 0 \
-          "https://f000.backblazeb2.com/file/OpenDRR/opendrr-boundaries-${boundaries_branch}.sql"
-
-    RUN curl -O --retry 999 --retry-max-time 0 \
-        "https://opendrr.eccp.ca/file/OpenDRR/opendrr-boundaries-${boundaries_branch}.sql.sha256sum" || \
-      RUN curl -O --retry 999 --retry-max-time 0 \
-          "https://opendrr.eccp.ca/file/OpenDRR/opendrr-boundaries-${boundaries_branch}.sql.sha256sum" || \
-      RUN curl -O --retry 999 --retry-max-time 0 \
-          "https://f000.backblazeb2.com/file/OpenDRR/opendrr-boundaries-${boundaries_branch}.sql.sha256sum"
-
-    RUN mv -fv "opendrr-boundaries-${boundaries_branch}.sql" opendrr-boundaries.sql
-    RUN mv -fv "opendrr-boundaries-${boundaries_branch}.sql.sha256sum" opendrr-boundaries.sql.sha256sum
-
   else
     # For a feature/topic branch, we download the artifact from the latest
     # action run that matches our criteria