testing: on timeout, running tests: message includes non-running parent tests

[bcmills]

Go version

commit d1dcffd

What operating system and processor architecture are you using (go env)?

wasip1-wasm-wazero at d1dcffdb4a40f8ea89d9e57744142f9805b64840

:: Running /workdir/go/src/make.bash with args ["/workdir/go/src/make.bash"] and env ["HOSTNAME=buildlet-linux-amd64-wasip1-wasm-wazero-rnb6e0d3c" "DEBIAN_FRONTEND=noninteractive" "HOME=/root" "USER=root" "GO_STAGE0_NET_DELAY=0s" "GO_STAGE0_DL_DELAY=200ms" "WORKDIR=/workdir" "GOROOT_BOOTSTRAP=/workdir/go1.4" "GO_BUILDER_NAME=wasip1-wasm-wazero" "GOOS=wasip1" "GOARCH=wasm" "GOHOSTOS=linux" "GOHOSTARCH=amd64" "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/workdir/go/misc/wasm" "GO_DISABLE_OUTBOUND_NETWORK=1" "GOWASIRUNTIME=wazero" "GOBIN=" "TMPDIR=/workdir/tmp" "GOCACHE=/workdir/gocache" "GOPLSCACHE=/workdir/goplscache" "PWD=/workdir/go/src"] in dir /workdir/go/src

…

##### Test execution environment.
# GOARCH: wasm
# CPU: 
# GOOS: wasip1
# OS Version: UNKNOWN: error determining OS version: unable to determine OS version: unsupported operation

### What did you do?

https://build.golang.org/log/c8fc86fc4fd4a47a9f825128843b56e2e61db057

### What did you expect to see?

A `running tests` message that indicates the specific tests that are actually running a test or cleanup function, but does not include tests that are blocked in `testing.T.Parallel`, and _also_ does not include parent tests that are blocked on waiting for their own child subtests to complete.

In this case, something like:

panic: test timed out after 3m0s
running tests:
TestTransportExpect100Continue/h1 (2s)

### What did you see instead?

panic: test timed out after 3m0s
running tests:
TestClientRedirectNoLocation (2m49s)
TestClientRedirectNoLocation/h1 (2m20s)
TestClientRedirectNoLocation/h2 (2m20s)
TestConnContextNotModifyingAllContexts (2m48s)
TestContentEncodingNoSniffing (2m48s)
TestContentTypeWithVariousSources (2m48s)
TestDisableContentLength (2m48s)
TestDisableKeepAliveUpgrade (2m48s)
TestGetBody (2m48s)
TestHandlerSetsBodyNil (2m48s)
TestHeadBody (2m48s)
TestNoContentLengthIfTransferEncoding (2m48s)
TestParseFormCleanup (2m48s)
TestQuerySemicolon (2m48s)
TestRequestBodyCloseDoesntBlock (2m48s)
TestReuseRequest (2m48s)
TestRoundTripGzip (2m48s)
TestSOCKS5Proxy (2m48s)
TestServerCancelsReadHeaderTimeoutWhenIdle (2m48s)
TestServerCancelsReadTimeoutWhenIdle (2m48s)
TestServerConnState (2m48s)
TestServerContentTypeSniff (2m48s)
TestServerContext_LocalAddrContextKey (2m48s)
TestServerContext_ServerContextKey (2m48s)
TestServerContexts (2m48s)
TestServerDuplicateBackgroundRead (2m48s)
TestServerEmptyBodyRace (2m48s)
TestServerFlushAndHijack (2m48s)
TestServerHandlersCanHandleH2PRI (2m48s)
TestServerHijackGetsBackgroundByte (2m48s)
TestServerHijackGetsBackgroundByte_big (2m48s)
TestServerIdleTimeout (2m48s)
TestServerIssue5953 (2m48s)
TestServerKeepAliveAfterWriteError (2m48s)
TestServerKeepAlivesEnabledResultClose (2m48s)
TestServerRequestContextCancel_ConnClose (2m48s)
TestServerRequestContextCancel_ServeHTTPDone (2m48s)
TestServerSetKeepAlivesEnabledClosesConns (2m48s)
TestServerShutdown (2m48s)
TestServerShutdownStateNew (2m48s)
TestSniffWriteSize (2m48s)
TestStressSurpriseServerCloses (2m48s)
TestTimeoutHandlerSuperfluousLogs (2m48s)
TestTransportConnectionCloseOnRequest (2m48s)
TestTransportConnectionCloseOnRequestDisableKeepAlive (2m48s)
TestTransportConnectionCloseOnResponse (2m48s)
TestTransportExpect100Continue (2m48s)
TestTransportExpect100Continue/h1 (2s)
TestTransportGzip (2m48s)
TestTransportHeadResponses (2m48s)
TestTransportIdleCacheKeys (2m48s)
TestTransportKeepAlives (2m48s)
TestTransportMaxConnsPerHost (2m48s)
TestTransportMaxConnsPerHostIncludeDialInProgress (2m48s)
TestTransportMaxPerHostIdleConns (2m48s)
TestTransportReadToEndReusesConn (2m48s)
TestTransportRemovesDeadIdleConnections (2m48s)
TestTransportRespectRequestWantsClose (2m48s)
TestTransportServerClosingUnexpectedly (2m48s)
TestUnsupportedTransferEncodingsReturn501 (2m48s)
TestWriteHeaderSwitchingProtocols (2m48s)

[bcmills]

I think this was incidentally fixed in https://go.dev/cl/506755, but reverted in https://go.dev/cl/544895 due to other regressions.

[gopherbot]

Change https://go.dev/cl/546018 mentions this issue: testing: remove tests from the running log while they are waiting on parallel subtests