Add lke_node_pool data source

[dawiddzhafarov]

📝 Description

This PR adds a new, lke_node_pool data source.
It requires providing two attributes:

• id - The Node Pool's ID.
• cluster_id - The Cluster's ID.

Returns details about the specific Node Pool.

✔️ How to Test

To run integrations tests:

make PKG_NAME="lkenodepool" TEST_CASE="TestAccDataSourceLKENodePool_basic" test-int

I would like to add another test for enterprise cluster, but I need to have access to the admin panel. But I think it's not required for this PR to be merged if I won't gain the access.

[Copilot]

Pull request overview

Adds a new Terraform data source linode_lke_node_pool to fetch details for a specific LKE node pool by id and cluster_id, along with integration tests and documentation.

Changes:

• Introduces a new framework data source implementation + schema for linode_lke_node_pool.
• Adds integration coverage for basic read + not-found scenarios using new acceptance templates.
• Adds public documentation for the new data source.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
linode/lkenodepool/tmpl/template.go	Exposes template helpers for data source acceptance test configs.
linode/lkenodepool/tmpl/data_basic.gotf	Adds acceptance config for a successful data source read.
linode/lkenodepool/tmpl/data_cluster_not_found.gotf	Adds acceptance config for invalid cluster lookup.
linode/lkenodepool/tmpl/data_nodepool_not_found.gotf	Adds acceptance config for invalid node pool lookup.
linode/lkenodepool/framework_models.go	Adds data source state model + parser from API types.
linode/lkenodepool/framework_datasource.go	Implements the data source Read logic.
linode/lkenodepool/framework_datasource_schema.go	Defines the Terraform schema for the data source.
linode/lkenodepool/framework_datasource_test.go	Adds integration tests for the new data source.
linode/framework_provider.go	Registers the new data source in the provider.
docs/data-sources/lke_node_pool.md	Adds documentation for the new data source.
docs/data-sources/lke_cluster.md	Fixes a markdown header formatting issue.

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[ezilber-akamai]

Looks good overall! I did get the following error when running the test locally:

=== CONT  TestAccDataSourceLKENodePool_basic
    test_retry.go:82: FATAL: Step 1/3 error: Check failed: Check 4/25 error: data.linode_lke_node_pool.test: Attribute 'disk_encryption' expected "disabled", got "enabled"
    test_retry.go:37: Retrying TestAccDataSourceLKENodePool_basic due to failure. (Attempt 1)
    test_retry.go:82: FATAL: Step 1/3 error: Check failed: Check 4/25 error: data.linode_lke_node_pool.test: Attribute 'disk_encryption' expected "disabled", got "enabled"
    test_retry.go:37: Retrying TestAccDataSourceLKENodePool_basic due to failure. (Attempt 2)
    test_retry.go:40: Test failed after 2 attempts
--- FAIL: TestAccDataSourceLKENodePool_basic (377.63s)

[vshanthe]

Passing locally LGTM