selftests/tc-testing: require an up to date iproute2 for blockcast tests

Add the dependsOn test check for all the mirred blockcast tests.
It will prevent the issue reported by LKFT which happens when an older
iproute2 is used to run the current tdc.

Tests are skipped if the dependsOn check fails.

Reported-by: Linux Kernel Functional Testing <lkft@linaro.org>
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Link: https://lore.kernel.org/r/20240229143825.1373550-1-pctammela@mojatatu.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>