Move get_api_key helper to shared lib and refactor direct calls to secretmanager.

[clincoln8]

• Splits _get_api_key helper into get_gcp_secret and get_api_key. The latter first checks if api key is present as an environment variable and if not, then calls get_gcp_secret to fetch the key from GCP.

• Migrates the two other secretmanager accesses in the website repo to use the get_gcp_secret helper in the shared lib utils.

[gmechali]

LGTM - I assume you did run local to confirm everything still works, but just calling it out in case :)

[clincoln8]

LGTM - I assume you did run local to confirm everything still works, but just calling it out in case :)

The following commands for running locally worked:

./run_server.sh -e lite
./run_server.sh -e biomedical
./run_server.sh -m
./run_server.sh

Is there a way to test the change to runner.py and send_email.py?