Use correct env variables for blobstore in Syntactic worker

[antonsviridov-src]

This was a mistake on my part – those two env variables are not used by syntactic worker itself, but by the part of precise worker that it embeds – so they should be exactly the same as in precise work

Checklist

• Follow the manual testing process
• Update changelog
• Update Kubernetes update doc

Test plan

• N/A

[jdpleiness]

I ran these changes locally and all seems to run well:

❯ k get pods
NAME                                           READY   STATUS             RESTARTS        AGE
blobstore-bb4dfbfb8-57nt7                      1/1     Running            0               5m27s
cadvisor-q6vs6                                 0/1     CrashLoopBackOff   5 (2m4s ago)    5m27s
codeinsights-db-0                              2/2     Running            0               5m27s
codeintel-db-0                                 2/2     Running            0               5m27s
gitserver-0                                    1/1     Running            2 (3m45s ago)   5m27s
grafana-0                                      1/1     Running            0               5m27s
indexed-search-0                               2/2     Running            0               5m27s
node-exporter-7kdcg                            1/1     Running            0               5m27s
otel-agent-2t8jt                               1/1     Running            0               5m27s
otel-collector-8474cfc945-q52q5                1/1     Running            0               5m27s
pgsql-0                                        2/2     Running            0               5m27s
precise-code-intel-worker-56fcb8b568-dndfp     1/1     Running            1 (3m57s ago)   5m27s
precise-code-intel-worker-56fcb8b568-tlmw9     1/1     Running            1 (3m57s ago)   5m27s
prometheus-6f77c8b8c9-72msn                    1/1     Running            0               5m27s
redis-cache-85769b5b68-bmmxx                   2/2     Running            0               5m27s
redis-store-57fcc6bc75-49kfn                   2/2     Running            0               5m27s
repo-updater-56fc4cfd65-mtmzk                  1/1     Running            5 (4m12s ago)   5m27s
searcher-0                                     1/1     Running            0               5m27s
sourcegraph-frontend-75dcf95c75-2lprl          1/1     Running            0               5m27s
sourcegraph-frontend-75dcf95c75-rj8lg          1/1     Running            0               5m27s
symbols-0                                      1/1     Running            0               5m27s
syntactic-code-intel-worker-757d7bc48b-fb8vk   1/1     Running            0               4m33s
syntactic-code-intel-worker-757d7bc48b-h5h6l   1/1     Running            0               4m33s
syntect-server-7864888d76-56z5w                1/1     Running            0               5m27s
worker-85cfd4bc77-ght2z                        1/1     Running            1 (3m47s ago)   5m27s

Unit tests work as expected:

❯ helm unittest ./charts/sourcegraph/.

### Chart [ sourcegraph ] ./charts/sourcegraph/.

 PASS  affinity charts/sourcegraph/tests/affinity_test.yaml
 PASS  cadvisorPrivileged       charts/sourcegraph/tests/cadvisorPrivileged_test.yaml
 PASS  checksumTest     charts/sourcegraph/tests/checksum_test.yaml
 PASS  postgresAdditionalConfig charts/sourcegraph/tests/codeInsightsDBAdditionalConfig_test.yaml
 PASS  codeIntelDBAdditionalConfig      charts/sourcegraph/tests/codeIntelDBAdditionalConfig_test.yaml
 PASS  defaultTagPrefix charts/sourcegraph/tests/defaultTagPrefix_test.yaml
 PASS  localDevMode     charts/sourcegraph/tests/localDevMode_test.yaml
 PASS  nodeExporter     charts/sourcegraph/tests/nodeExporter_test.yaml
 PASS  otelAgentHostPort        charts/sourcegraph/tests/otelAgentHostPort_test.yaml
 PASS  otelCollectorJaeger      charts/sourcegraph/tests/otelCollectorJaeger_test.yaml
 PASS  pgsqlAdditionalConfig    charts/sourcegraph/tests/pgsqlAdditionalConfig_test.yaml
 PASS  pgsqlAuth        charts/sourcegraph/tests/pgsqlAuth_test.yaml
 PASS  podDisruptionBudget      charts/sourcegraph/tests/podDisruptionBudget_test.yaml
 PASS  priorityClass    charts/sourcegraph/tests/priorityClass_test.yaml
 PASS  prometheusPrivileged     charts/sourcegraph/tests/prometheusPrivileged_test.yaml
 PASS  serviceAccountAnnotations        charts/sourcegraph/tests/serviceAccountAnnotations_test.yaml
 PASS  serviceAccount   charts/sourcegraph/tests/serviceAccounts_test.yaml
 PASS  storageClass     charts/sourcegraph/tests/storageClass_test.yaml
 PASS  worker   charts/sourcegraph/tests/worker_test.yaml

Charts:      1 passed, 1 total
Test Suites: 19 passed, 19 total
Tests:       78 passed, 78 total
Snapshot:    12 passed, 12 total
Time:        1.3736565s