Add support for increased block storage volume limits

[dawiddzhafarov]

📝 Description

This PR adds support for configuring up to 64 devices (volumes/disks) per Linode Instance Configuration, depending on the Linode's RAM.
Previously you could define 8 slots: sda-sdh.
Now you can define sda-sdz, sdaa-sdaz and sdba-sdbl.

There was also a bug in the logic, when if you have skipped consecutive device from configuration, it was added anyway as a Null object.

✔️ How to Test

In order to utilize the logic for increased block storage volume limits, make sure to use proj/block-storage-volume-limit-increase branch inside linode_api4-python repository. (I have used: pip install -e .)

To run unit tests (1 new unit test case):
make test-unit

To run Integration tests:
make integration-test TEST_SUITE=instance_volumes_limit

[Copilot]

Pull request overview

This PR expands the Linode Instance module’s configuration device mapping from 8 slots (sda–sdh) up to 64 slots (up to sdbl), and adds logic intended to avoid passing unintended null devices while also enforcing a per-instance-type device limit derived from RAM.

Changes:

• Add generate_device_suffixes() helper to produce the expanded device suffix set (64 total).
• Update the instance module’s device schema and config creation logic to use the expanded suffix set and enforce a calculated device limit.
• Add a unit test for suffix generation and a new integration test target for validating volume attachment limits.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
plugins/module_utils/linode_helper.py	Adds a constant and helper to generate supported device suffixes up to 64.
plugins/modules/instance.py	Expands device spec keys to 64 and adds device reconciliation/limit enforcement before config creation.
tests/unit/module_utils/test_linode_helper.py	Adds a unit test validating the generated suffix list.
tests/integration/targets/instance_volumes_limit/tasks/main.yaml	New integration test validating attachment up to a limit and failure beyond it.
docs/modules/instance.md	Documents the expanded set of device keys in the module docs.

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[yec-akamai]

When running the integration test locally, it failed at Create a Linode instance with 16 volumes: /linode_api4/objects/linode.py\", line 1307, in config_create\n device_map[device_names[i]] = {\"volume_id\": d.id}\n ~~~~~~~~~~~~^^^\n\nIndexError: list index out of range\n"