roachtest: update backup fixtures

Previously, backup fixture creation was a manual process. Now, fixture
creation will run as a roachtest and use the fixture registry utility
added by cockroachdb#140368.

Fixture generation was reworked to use import instead of old backup
fixtures. This makes it trivial to bootstrap fixtures in new clouds and
in new fixture buckets.

Release note: none
Part of: cockroachdb#139159

build/teamcity/util/roachtest_util.sh

@@ -11,6 +11,9 @@ if [[ "$GOOGLE_EPHEMERAL_CREDENTIALS" ]]; then
   echo "$GOOGLE_EPHEMERAL_CREDENTIALS" > creds.json
   gcloud auth activate-service-account --key-file=creds.json
   export ROACHPROD_USER=teamcity
+
+  # Set GOOGLE_APPLICATION_CREDENTIALS so that gcp go libraries can find it.
+  export GOOGLE_APPLICATION_CREDENTIALS="$(pwd)/creds.json"
 else
   echo 'warning: GOOGLE_EPHEMERAL_CREDENTIALS not set' >&2
   echo "Assuming that you've run \`gcloud auth login\` from inside the builder." >&2

pkg/cmd/roachtest/tests/BUILD.bazel

@@ -220,6 +220,7 @@ go_library(
         "//pkg/cloud",
         "//pkg/cloud/amazon",
         "//pkg/cloud/gcp",
+        "//pkg/clusterversion",
         "//pkg/cmd/cmpconn",
         "//pkg/cmd/roachprod-microbench/util",
         "//pkg/cmd/roachtest/cluster",
@@ -247,6 +248,7 @@ go_library(
         "//pkg/multitenant/mtinfopb",
         "//pkg/roachpb",
         "//pkg/roachprod",
+        "//pkg/roachprod/blobfixture",
         "//pkg/roachprod/config",
         "//pkg/roachprod/errors",
         "//pkg/roachprod/install",