Create Python script to re-enable workflows

We want to create a Python script which will re-enable some workflows. This roughly looks like:

```julia
# Get a list of all packages in the Invenia repository as well as others such as AWS.jl
# Get the PAT from SecretsManager

# Make an HTTP GET request to the following to get all workflows for the repository
# - https://api.github.com/repos/Invenia/Checkpoints.jl/actions/workflows

# Iterate over all these workflows and create an authenticated request to,
# NOTE: workflow_id can be replaced by it's file name
# - https://api.github.com/repos/Invenia/Checkpoints.jl/actions/workflows/{WORKFLOW_ID}/enable
```

No target file or entry point is named; start by reviewing the repository structure and existing workflow or script conventions. Use the listed GitHub Actions endpoints and the repository's AWS SecretsManager context to determine the authenticated requests needed. Done means a Python script can obtain the PAT, list the repository workflows, and request that each workflow be enabled.

Written by the indexing model from the issue text.