tf-m-infra-health: Remove no longer needed / broken job

Per https://linaro.atlassian.net/browse/TFC-435. This job apparently was
useful while initially setting up TF-M CI infra, but is broken for a
long time and apparently nobody is looking into it. Remove, to concentrate
on the support of actively used jobs.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I14d868ddc0b79914e929978307089d85fd5a174d
1 file changed