TPT-4240: Remove LKE cluster dashboard function, tests, and related fixture

[zliang-akamai]

📝 Description

As requested by the LKE team, removing this deprecated API in linodego v2.

[Copilot]

Pull request overview

This PR removes the deprecated LKE cluster dashboard API surface from linodego v2, along with the associated unit/integration tests and recorded fixtures.

Changes:

• Removed GetLKEClusterDashboard client method and the LKEClusterDashboard response type.
• Deleted unit/integration tests covering the dashboard endpoint.
• Removed the unit JSON fixture and the go-vcr integration YAML cassette for the dashboard test.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lke_clusters.go	Removes the exported dashboard type and client method for the deprecated dashboard endpoint.
test/unit/lke_clusters_test.go	Deletes the unit test that exercised GetLKEClusterDashboard.
test/unit/fixtures/lke_cluster_dashboard.json	Removes the no-longer-used unit test fixture.
test/integration/lke_clusters_test.go	Deletes the integration test and drops the now-unused net/url import.
test/integration/fixtures/TestLKECluster_Dashboard_Get.yaml	Removes the recorded integration cassette for the deleted test.

Comments suppressed due to low confidence (1)

lke_clusters.go:277

• Removing GetLKEClusterDashboard/LKEClusterDashboard is a breaking change for consumers of the Go client (compile-time API removal). Please ensure this removal is called out prominently in the release notes / upgrade guidance for the next release so downstream users can migrate accordingly.

// RecycleLKEClusterNodes recycles all nodes in all pools of the specified LKE Cluster.
func (c *Client) RecycleLKEClusterNodes(ctx context.Context, clusterID int) error {
	e := formatAPIPath("lke/clusters/%d/recycle", clusterID)
	return doPOSTRequestNoRequestResponseBody(ctx, c, e)

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