Core Rule Set tests: check the recorded requests without the race detector (closes #290)

The tests that check the apps' recorded requests move to
internal/coreruleset/recorded_test.go, behind the recorded build tag. The
test phase runs only those tests in a second go test, without -race. The
lint phase reads the same file, with the same tag.

The Gitea and WordPress tests are split in two. Their recorded-request loops
become TestOrdinaryGiteaRequestsPass and TestOrdinaryWordPressRequestsPass;
their attack checks stay in the race pass as TestGiteaAttacksAreRefused and
TestWordPressAttacksAreRefused.

Model: opus-5-5

internal/coreruleset/vaultwarden_test.go

@@ -27,12 +27,6 @@ const (
 // vaultwardenEmail is a JSON body that sends an address in email.
 const vaultwardenEmail = `{"email":"VALUE"}`
 
-func TestOrdinaryVaultwardenRequestsPass(t *testing.T) {
-	t.Parallel()
-
-	wantRecordedRequestsPass(t, "vaultwarden-requests.txt")
-}
-
 // vaultwardenField is a field Vaultwarden receives in plain text: the
 // request that sends it, and its body, with VALUE where the field's value
 // goes.