[wrangler] Preserve D1 migration paths during redirected provisioning

[xgame92]

Fixes #15484.

When deployments use a redirected config, resource provisioning currently writes the complete generated binding back to the original user config. Generated configs can contain paths rebased relative to their own location, so provisioning a D1 database through the Vite plugin replaces a user-authored migrations_dir with a path that is invalid in the source config.

This changes redirected writeback to start from the original binding and overlay only the newly provisioned resource identifier. Non-redirected writeback remains unchanged, and bindings injected only by the redirected config are still excluded.

Tests:

• pnpm --dir packages/wrangler test:ci src/__tests__/provision.test.ts
• pnpm --dir packages/deploy-helpers check:type
• pnpm --dir packages/wrangler check:type
• changed-file oxlint and oxfmt checks

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: This fixes config writeback behavior without changing the public API or user workflow.

A picture of a cute animal (not mandatory, but encouraged)

[changeset-bot]

🦋 Changeset detected

Latest commit: fdc6ad1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
wrangler	Patch
@cloudflare/deploy-helpers	Patch
@cloudflare/vite-plugin	Patch
@cloudflare/vitest-plugin	Patch
@cloudflare/remote-bindings	Patch

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commit: fdc6ad1

[xgame92]

CI note: the only failing check is Vite Plugin Playground (windows-latest, vite-8), where the unrelated react-spa experimental headers/redirects suite timed out in beforeAll after the matrix had completed 94 suites / 287 tests. I reproduced that exact suite locally on Windows with Vite 8.1.5 after building the plugin: 1 file passed, with 6 passing and 3 expected-failure tests, in 8.39s. I cannot rerun the GitHub job because failed-job reruns require repository admin permission.