Add Windows as unsupported for Egress gateway and sync the strucuture for AWS, Azure and On premise

[sujeet-kr]

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[Copilot]

Pull request overview

This PR documents that Windows is not supported for Egress gateway functionality across AWS, Azure, and on-premise deployments. Additionally, it standardizes the documentation structure by changing "Unsupported" to "Not supported" in the on-premise documentation to match the terminology used in AWS and Azure docs.

Key changes:

• Added Windows to the list of unsupported platforms for egress gateway in AWS, Azure, and on-premise environments
• Standardized terminology from "Unsupported" to "Not supported" in on-premise documentation
• Reorganized "Before you begin" section in on-premise docs to match AWS/Azure structure (moving unsupported platforms after required items)

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
calico-enterprise/networking/egress/egress-gateway-on-prem.mdx	Standardized section heading to "Not supported", moved section after "Required", and added Windows to unsupported list
calico-enterprise/networking/egress/egress-gateway-azure.mdx	Added Windows to the "Not Supported" list
calico-enterprise/networking/egress/egress-gateway-aws.mdx	Added Windows to the "Not Supported" list

[Copilot]

The 'Not supported' section should appear before the 'Required' section to maintain consistency with the existing AWS and Azure documentation structure, where unsupported items are listed first in the 'Before you begin' section.

Suggested change

	**Required**
	- Calico CNI
	- Open port UDP 4790 on the host
	**Not supported**
	- GKE
	- Windows
	**Not supported**
	- GKE
	- Windows
	**Required**
	- Calico CNI
	- Open port UDP 4790 on the host

[Copilot]

Corrected capitalization to match AWS and Azure docs which use 'Not Supported' (with capital S).

Suggested change

	**Not supported**
	**Not Supported**

[ctauchen]

LGTM! Ok to merge?