[GN/iOS] Explicitly list test data in sql_unittests_bundle_data.
[GN/iOS] Explicitly list test data in sql_unittests_bundle_data.

Since timestamp of directory is not always updated when the content
is changed (e.g. when a file content is changed, ...) listing just
the directory lead to flaky incremental builds and bot failures.

Explicitly list all test data files to fix those flakes.

BUG=459705

Review URL: https://codereview.chromium.org/1898753002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#387928}

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