docs: Readme and deployment doc update

[AjitPadhi-Microsoft]

Purpose

• This pull request makes several small but important updates to documentation and deployment parameter defaults, primarily to improve clarity and ensure consistency with current deployment practices.

Documentation updates:

• Updated the list of supported Azure regions in the README.md to reflect the latest availability of required services.
• Corrected the allowed length for environment names in docs/CustomizingAzdParameters.md from 3-20 to 3-16 characters.
• Fixed a typo in docs/azure_app_service_auth_setup.md ("idenity" → "identity").

Deployment parameter updates:

• Changed the default value of AZURE_ENV_IMAGETAG from latest_v3 to latest_v4 in docs/CustomizingAzdParameters.md to ensure deployments use the latest image tag.
• Updated infra/main.parameters.json to use AZURE_ENV_IMAGE_TAG=latest_v4 as the default for all container image tags, aligning deployment parameters with the new default.

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

• ...

Other Information

will review once again

[Copilot]

Pull request overview

This PR updates documentation and deployment defaults to better reflect current deployment practices, including the default container image tag and supported regions guidance.

Changes:

• Updated README.md example Azure regions list for required services availability.
• Updated default container image tag in infra/main.parameters.json to default to latest_v4.
• Corrected documentation details in docs/CustomizingAzdParameters.md (env name length, default image tag) and fixed a typo in docs/azure_app_service_auth_setup.md.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
README.md	Updates example Azure regions list for required services.
infra/main.parameters.json	Defaults container image tag parameters to latest_v4.
docs/CustomizingAzdParameters.md	Updates env name length guidance and default image tag (but needs env var name alignment).
docs/azure_app_service_auth_setup.md	Fixes a typo (“identity”).

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[github-actions]

🎉 This PR is included in version 4.2.1 🎉

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