[bazel] Tag test_suites to fix --build_tag_filters=-verilator
[bazel] Tag test_suites to fix --build_tag_filters=-verilator

The test suites are useful for individual invocations like
`bazel build //sw/device/tests:aes_entropy_test`

When using wildcard invocations, disabling the test suite
by tagging it with manual is effective in preventing invocations
like:
`bazel build --build_tag_filters=-verilator //sw/device/tests/...`
from building the test_suite which depends on the verilator image.
`//sw/device/tests/...` includes the verilator tests already so we don't
need the test_suite to make this function properly.

Tested:
bazel build //sw/device/tests:aes_entropy_test
bazel build --build_tag_filters=cw310 //sw/device/tests:aes_entropy_test
bazel build --build_tag_filters=cw310 //sw/device/tests/...

Signed-off-by: Drew Macrae <32d48ac45113625c0a04afe7343eae478a303684@google.com>

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