[wrangler] Condense repeated environment config warnings

[MattieTK]

Condense repeated Wrangler environment configuration warnings.

This updates config validation so repeated missing vars and define entries are summarised in one warning with a list of missing keys. It also avoids emitting the experimental unsafe warning twice when unsafe appears at both the top level and in the active environment.

---

• 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 only changes warning formatting.

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[changeset-bot]

🦋 Changeset detected

Latest commit: b08597a

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

This PR includes changesets to release 3 packages

Name	Type
wrangler	Patch
@cloudflare/vite-plugin	Patch
@cloudflare/vitest-pool-workers	Patch

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[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/wrangler

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[github-actions]

✅ All changesets look good

[ask-bonk]

Everything looks correct. The changes are well-structured and all tests pass. Let me do a final summary of the review:

Summary of changes:

1. validateVars: Condensed per-key warnings into a single warning with a bullet list of missing keys.
2. validateDefines: Same condensation for define entries.
3. unsafe experimental warning: Added a guard to skip the experimental warning for named environments when unsafe already exists at the top level (preventing a duplicate warning).
4. Tests: Added a new test for the condensed vars warning, updated an existing define snapshot to match new format, and added BAR: "bar" to an existing test fixture.

The logic is correct, tests pass, and there are no issues I can identify. The changeset is properly scoped to wrangler as a patch.

LGTM

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[workers-devprod]

Codeowners reviews satisfied

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commit: b08597a

[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/wrangler

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