Request: support for providing Slurm Accounting DatabaseName to ParallelCluster UI

We are currently developing a migration plan in between ParallelCluster versions, which includes a ParallelCluster UI upgrade when new versions are available. So far, one of the road blocks we are running into is how Slurm Accounting databases can be migrated between ParallelCluster versions, see https://github.com/aws/aws-parallelcluster/issues/6214.

In the issue, it was mentioned that with newer ParallelCluster versions it seems to be possible to supply a `DatabaseName` for the Slurm Accounting database, which seems to have been included in ParallelCluster since September/October 2023: https://github.com/aws/aws-parallelcluster/pull/5718.

In the issue, we are exploring the migration use case. It was suggested to create a request here about support for `DatabaseName` in ParallelCluster UI. Effectively, it boils down to adding a field to the UI which passes the specified database name to ParallelCluster when the cluster is created.

Wondering what's possible, thanks in advance for your insights!

Start by tracing the ParallelCluster UI's cluster-creation form and request path, then inspect how existing Slurm accounting settings are represented and tested. Done means the UI accepts a Slurm Accounting DatabaseName and passes the specified value to ParallelCluster during cluster creation, with relevant tests updated or added.

Written by the indexing model from the issue text.