fix: move DEV deployment verification to DEV CI/CD workflow

[TaprootFreak]

Problem

The verify-dev-deployment check in api-pr.yaml was supposed to ensure that DEV is running the latest code before a release PR (develop → main) can be merged. However, this check never actually ran on release PRs.

Root cause: The auto-release-pr.yaml workflow creates the release PR using GITHUB_TOKEN. GitHub does not trigger pull_request events for actions performed by GITHUB_TOKEN (to prevent infinite workflow loops). As a result, api-pr.yaml was never triggered when the release PR was created, and the verify-dev-deployment job was effectively dead code.

Solution

Move the DEV deployment verification from api-pr.yaml into api-dev.yaml as a post-deploy step:

• api-dev.yaml: After deploying to Azure, poll dev.api.dfx.swiss/version until the expected commit SHA is live (up to 15 min)
• api-pr.yaml: Remove the dead verify-dev-deployment job and the if: github.head_ref != 'develop' guard on the build job

This works because api-dev.yaml runs on every push to develop, and its check status automatically appears on the release PR (since develop is the head branch).

Test plan

• Push to develop and verify the Verify DEV deployment step runs after Azure deploy
• Verify the check appears on the release PR (develop → main)