Problem

Currently when you call the list_clusters tool, it asks for a project name (even if it's already specified in a env variable).

Suggested Solution

We can update the list_projects tool so that it takes in a default project:

• If the project isn't specified, we make the parameter required.
• If the project is specified, we make it an optional parameter with the project as the default.

e.g. config:

tools:
  list_clusters:
    kind: alloydb-list-clusters
    source: alloydb-admin-source
    defaultProject: ${ALLOYDB_POSTGRES_PROJECT:""}