[iOS] Define bundle_data target for //sql:sql_unittests.
[iOS] Define bundle_data target for //sql:sql_unittests.

This ensure that the files required by sql_unittests application
will be copied into the application bundle on iOS.

BUG=297668

Review URL: https://codereview.chromium.org/1811633002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#381976}

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