What were you trying to do that didn't work?

I tried to use `insights-client` with a RHEL for Edge system, by including `insights-client` in the blueprint used to produce the RHEL for Edge commit.

Once I booted the RHEL for Edge system, I tried to use `insights-client --register` but it failed because I didn't have any RHSM certs present on my system.

When I tried to run `subscription-manager register` to get the necessary certificates, I found that the `subscription-manager` command was not available.

I propose that because the preferred methods for registering with Insights are either RHSM certs or activation keys, the `subscription-manager` package should be required to be installed with `insights-client`. 

Please provide the package NVR for which bug is seen:

insights-client-3.2.2-1.el9_3.noarch

How reproducible:

Always

Steps to reproduce

 1. Create osbuild blueprint that includes `insights-client`
 2. Use osbuild to produce an `edge-commit` artifact
 3. Use osbuild to produce an `edge-installer` artifact
 4. Install the `edge-installer` artifact
 5. Try to run `insights-client --register`

Expected results

`subscription-manager` is an install requirement for `insights-client`

Actual results

After running `insights-client --register` on the system,  I see the following:

$ sudo insights-client --register
Unable to fetch egg url https://cert-api.access.redhat.com/r/insights/platform/module-update-router/v1/channel?module=insights-core: 401: Unauthorized. Defaulting to /release
Please ensure that the system is registered with RHSM for CERT auth, or that correct credentials are set in /etc/insights-client/insights-client.conf for BASIC auth.
Machine-id found, insights-client can not be registered. Please, unregister insights-client first: `insights-client --unregister`

But since `subscription-manager` was not pulled in during the install of `insights-client`, I am unable to register with RHSM