TPT-4113: Add support for Expand Create Linodes Options and Password-less Linodes

[ezilber-akamai]

📝 Description

Added support for SLADE + CLEO features.

✔️ How to Test

make test-unit
make test-int

[Copilot]

Pull request overview

This PR updates Linode instance/disk option structs and accompanying tests to support additional create-time fields (kernel/boot size) and to cover “password-less” provisioning behavior (authorized keys/users instead of root password) via unit + integration fixtures.

Changes:

• Add Kernel and BootSize to InstanceCreateOptions.
• Clarify/create test coverage around the requirement to provide one of root_pass, authorized_keys, or authorized_users when creating from an image.
• Strengthen unit tests by validating request bodies for instance create/rebuild and disk create, and add new integration tests + fixtures.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
instances.go	Adds Kernel/BootSize to instance create options; reorganizes option fields and adds documentation notes.
instance_disks.go	Updates disk create options documentation/field grouping around auth fields for image-based disk creation.
test/unit/instance_test.go	Validates POST request bodies for instance create/rebuild and updates create options to include kernel/boot size.
test/unit/instance_disks_test.go	Validates POST request body for disk creation and ensures root password is included in the test request.
test/integration/instances_test.go	Adds integration coverage for missing auth fields on image create, plus a kernel/boot-size create flow followed by disk create + rebuild.
test/integration/fixtures/TestInstance_TestExpectedErrorIfFieldsAuthorizedUsersAuthorizedKeysRootPassAreNotSet.yaml	New cassette covering 400 error when image create omits root_pass/authorized_keys/authorized_users.
test/integration/fixtures/TestInstance_TestCreateLinodeWithKernelAndBootSizeThenAddDiskAndRebuild.yaml	New cassette covering create-with-kernel/boot-size, disk creation (incl. busy retries), rebuild, and teardown.

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