develop: update serverless to starter (#20635)

[ti-chi-bot]

This is an automated cherry-pick of #20635

What is changed, added or deleted? (Required)

Updates "Create Cluster 页面默认选择 Serverless" to "Create Cluster 页面默认选择 Starter" in develop/dev-guide-build-cluster-in-cloud.md

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[ti-chi-bot]

@lilin90 This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

[ti-chi-bot]

@ti-chi-bot: ## If you want to know how to resolve it, please read the guide in TiDB Dev Guide.

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[qiancai]

/approve

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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