fix(php): use WIREMOCK_URL env var in Wire test setUp method

[iamnamananand996]

Description

Fixes PHP SDK Wire test files hardcoding http://localhost:8080 for the WireMock URL instead of reading from the WIREMOCK_URL environment variable. This prevented tests from working with dynamically assigned Docker ports in local development and CI/CD environments.

Changes Made

• Added $wiremockUrl = getenv('WIREMOCK_URL') ?: 'http://localhost:8080' variable declaration at the top of the generated setUp() method
• Multi-URL environment path (the actual bug): Changed Environments::custom('http://localhost:8080', 'http://localhost:8080') to Environments::custom($wiremockUrl, $wiremockUrl)
• Single-URL environment path (refactor): Changed inline getenv('WIREMOCK_URL') ?: 'http://localhost:8080' to use the shared $wiremockUrl variable
• Added version 2.2.1 entry in generators/php/sdk/versions.yml
• Updated all 15 seed snapshot files in seed/php-sdk/exhaustive/wire-tests/

Review Checklist

• Verify getMultiUrlEnvironmentForTest() — its return values are now effectively ignored (only the count of URLs matters for determining the number of $wiremockUrl args in Environments::custom()). This is intentional but worth confirming.
• No seed fixture currently exercises the multi-URL environment code path, which is the path that was actually broken. The single-URL path already worked. The fix is straightforward but untested in seeds.

Testing

• Seed tests regenerated and passing (php-sdk / exhaustive / wire-tests)
• Lint (pnpm run check) passing

Link to Devin session: https://app.devin.ai/sessions/7681b11c333f4ede905a09ca0a8e40cc
Requested by: @iamnamananand996

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