feat: Add Log Analytics workspace deletion guide and update deployment notes

[Abdul-Microsoft]

Purpose

• This pull request updates the deployment documentation to clarify the required steps for deleting resources when Log Analytics workspace replication is enabled. The changes ensure users are aware of the need to disable replication before attempting deletion, and provide a dedicated guide for the process.

Documentation improvements for Log Analytics workspace deletion:

• Added a note to the docs/DeploymentGuide.md instructing users to disable Log Analytics workspace replication before running azd down, with a reference to a new guide for detailed steps.
• Created a new file docs/LogAnalyticsReplicationDisable.md that explains how to disable replication on a Log Analytics workspace, provides the necessary Azure CLI commands, and outlines verification and next steps before deletion.

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

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