Added LKE release notes (#7053)

* Release notes for 1.77.0

* Added release notes for 1.72 and 1.75

* Added API link for labels and taints release note

docs/release-notes/lke/v1.72.0.md

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+---
+title: Linode Kubernetes Engine v1.72.0
+date: 2024-05-06
+version: 1.72.0
+---
+
+### Added
+
+- Added support for custom labels and taints, which can be applied to node pools through the Linode API. Review the [Add Labels and Taints to your LKE Node Pools](/docs/products/compute/kubernetes/guides/deploy-and-manage-cluster-with-the-linode-api/#add-labels-and-taints-to-your-lke-node-pools) documentation and the [Create a node pool](https://techdocs.akamai.com/linode-api/reference/post-lke-cluster-pools) API endpoint documentation for more details.

docs/release-notes/lke/v1.75.0.md

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+---
+title: Linode Kubernetes Engine v1.75.0
+date: 2024-06-19
+version: 1.75.0
+---
+
+### Changed
+
+- Upgraded clusters using Kubernetes 1.30 to patch version 1.30.2
+- Upgraded Block Storage CSI driver to [v0.8.0](https://github.com/linode/linode-blockstorage-csi-driver/releases/tag/v0.8.0)

docs/release-notes/lke/v1.77.0.md

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+---
+title: Linode Kubernetes Engine v1.77.0
+date: 2024-07-16
+version: 1.77.0
+---
+
+### Added
+
+- This release includes CoreDNS autoscaling, based on the [cluster-proportional-autoscaler](https://github.com/kubernetes-sigs/cluster-proportional-autoscaler) project. The number of CoreDNS pods now scales based on the number of nodes in the LKE cluster.
+
+### Changed
+
+- Removed support for Kubernetes v1.27