Fix issue referencing the Tests package from another Bazel workspace

[jszumski]

Allow BuiltInRulesTests data to be empty so a workspace can load the Tests package from a release archive.

Otherwise, Bazel users with --incompatible_disallow_empty_glob enabled will hit this error because the release archive only contains Swift files and not any test fixtures:

Error in glob: glob pattern 'BuiltInRulesTests/Resources/**' didn't match anything, but allow_empty is set to False (the default value of allow_empty can be set with --incompatible_disallow_empty_glob).

Note that --incompatible_disallow_empty_glob is enabled by default in Bazel 8

[SwiftLintBot]

	2 Messages
📖	Building this branch resulted in the same binary size as when built on main.
📖	Skipping OSS check because SwiftLint hasn't changed compared to main.

Generated by 🚫 Danger

[SimplyDanny]

Thanks!

Is this a regression? BuiltInRulesTests was newly added in 0.58.0. However, the resources were just moved from FrameworkTests and I don't see that allow_empty = True was previously specified there.

[jszumski]

I believe this worked previously because the old glob was:

filegroup(
    name = "SwiftLintFrameworkTestsData",
    srcs = glob(
        ["**/**"],
        # Bazel doesn't support paths with spaces in them
        exclude = ["SwiftLintFrameworkTests/Resources/FileNameNoSpaceRuleFixtures/**"],
    ),
    visibility = ["//visibility:public"],
)

which would end up matching some Swift source files in the release distribution and thus wasn't empty.