`newrelic-lambda integrations update` fails to update pre-0.9 stack due to `No newrelic-log-ingestion function in region ...` error

Description

Steps to Reproduce

1. Create a stack with the "old" function name, i.e. using a CLI version 0.8.0 or earlier
2. Attempt to update it with newrelic-lambda integrations update ... using CLI version 0.9.0

Expected Behaviour

The update should succeed, either renaming the function or preserving it with the old name.

It looks like #254 may have introduced some if statements that aren't working as intended given its stated goal of preserving compatibility.

https://github.com/newrelic/newrelic-lambda-cli/blob/f472e28ce78227986d0e1625cce1f54c7f76e075/newrelic_lambda_cli/integrations.py#L89-L103

In addition, it would be nice if the logs were more specific about which function doesn't exist. I would've identified the problem with far less effort if the error printed out No newrelic-log-ingestion-0aa... function in region, given we do have function called newrelic-log-ingestion as literally appears in the error message.

Relevant Logs / Console output

The update fails, with error:

✖️ No newrelic-log-ingestion function in region 'ap-southeast-2'. Run 'newrelic-lambda integrations install' to install it.
✖️ Update Incomplete. See messages above for details.

I inserted debug logs like the following:

modified   newrelic_lambda_cli/integrations.py
@@ -98,6 +98,7 @@ def get_newrelic_log_ingestion_function(session, stackname=None):
     unique_log_ingestion_name = get_unique_newrelic_log_ingestion_name(
         session, stackname
     )
+    print(f"DEBUG: {unique_log_ingestion_name=}")
     if unique_log_ingestion_name:
         function = get_function(session, unique_log_ingestion_name)
         return function

It prints DEBUG: unique_log_ingestion_name='newrelic-log-ingestion-0aa...'. That is, the function name has a unique suffix. Our AWS account indeed doesn't have a lambda with this name; although does have newrelic-log-ingestion.

Your Environment

macOS

# requirements.txt
newrelic-lambda-cli==0.9.0
boto3==1.34.59
botocore==1.34.59
jmespath==1.0.1
python-dateutil==2.9.0.post0
six==1.16.0
urllib3==2.0.7
s3transfer==0.10.0
click==8.1.7
colorama==0.4.6
emoji==2.10.1
gql==2.0.0
graphql-core==2.3.2
promise==2.3
Rx==1.6.3
requests==2.31.0
charset-normalizer==3.3.2
idna==3.6
certifi==2024.2.2
tabulate==0.9.0

Additional context

N/A