feat(dev-portal) update Azure DCR how-to to use Konnect API

[lmilan]

Description

Fixes #1558

Preview Links

Checklist

• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.
• Every page has a description entry in frontmatter.
• Add new pages to the product documentation index (if applicable).

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[Copilot]

Pull request overview

Updates the Dev Portal Azure AD Dynamic Client Registration (DCR) how-to to use Konnect API flows instead of Konnect UI steps, aligning with issue #1558’s goal of converting UI instructions to API instructions.

Changes:

• Adds konnect-api to the page frontmatter tools to reflect the new API-based workflow.
• Replaces Konnect UI instructions for creating a DCR provider and auth strategy with konnect_api_request examples.
• Updates prerequisites to use the standard “Configure a Dev Portal” and “Publish an API” prereq includes.