CRAYSAT-1841: Add support for CFS v2 or v3 to sat bootprep

Add support for using either the CFS v2 or v3 API in `sat bootprep`
based on the value of the command-line option `--cfs-version` or the
config-file option `cfs.api_version`. Before this change, `sat bootprep`
was hard-coded to always use CFS v2.

Update the `InputConfiguration`, `InputConfigurationLayer`, and
`AdditionalInventory` classes to keep a reference to the instance of the
version-specific subclass of `CFSClientBase`, so that they can delegate
operations to the appropriate version of the CFS API.

This removes a lot of code that required knowledge of the CFS API and
instead uses classes and methods defined in the `csm_api_client`
library, which has already been updated to support both CFS v2 and v3.
This should reduce code duplication across `sat` and `csm_api_client`.

Some unit tests are no longer needed here because that functionality is
tested in the `csm_api_client` instead. Other unit tests are updated to
include the `cfs_client` instance that needs to be passed into the input
layer and configuration objects.

This also makes the `playbook` property required in the schema because
the CFS v3 API requires that the playbook be specified. This is
technically a backwards-incompatible schema change because it can
invalidate certain bootprep input files if they define layers without
playbooks. The default bootprep files contain a playbook for every
layer and do not depend on the CFS default playbook value, so this
should be a pretty safe and non-disruptive change.

Test Description:
Unit tests only so far.

Still needs to be tested on a real system.

CHANGELOG.md

@@ -25,6 +25,18 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.33.0] - 2024-11-15
+
+### Added
+- Added support for using either the CFS v2 or v3 API in `sat bootprep`,
+  depending on the value of the `--cfs-version` command-line option or the
+  `cfs.api_version` config-file option.
+
+### Changed
+- Modified the `sat bootprep` input file schema to require the `playbook` field
+  be specified for each layer of a CFS configuration. The CFS v3 API requires a
+  playbook for each layer.
+
 ## [3.32.10] - 2024-11-04
 
 ### Fixed