* HeadFetcher data race fix
* bazel run //:gazelle -- fix
* add the db teardown to test
* add TestChainService_SaveHead_DataRace test
* split race and norace tests
* change testset name
* test CI with 'spectest' tag instead of 'raceon'
* one more test CI with 'spectest' tag instead of 'raceon'
* bazel run //:gazelle -- fix
* set test tag to 'race_on'
* not clone the state
