feat: enable optimization for platform tests

[ryzizub]

Description

Currently, the platform tests are running without optimization, which can make the test suite less performant. This is due to inconsistent behavior of platform tests when placed in the same file → https://github.com/VeryGoodOpenSource/very_good_cli/pull/1359/files#r2354792138

To enable optimization, further investigation of flutter test is needed to identify the issue that prevents platform tests from running in the same file.

Requirements

• All CI/CD checks are passing.
• There is no drop in the test coverage percentage.

Additional Context

No response

[ryzizub]

During research into what needs to be done to enable this, it seems to come down to two main points:

1. Updating the test optimizer brick – The test optimizer brick currently contains functionality that is not supported across all platforms. Since this brick would be used on every run, it needs to be updated to either use conditional imports or other methods to support all possible platforms. From the initial tests, it appears the only issue is with the GoldenLocalComparator and its basedir parameter, which is not supported when running on the web.
2. Test file naming issue – The tests are run from a single test optimizer file named .test_optimizer.dart. For some reason, Flutter does not support test files on the web that begin with a dot. This causes the tests to hang. Once the leading dot is removed, the tests run without issue.