feat(ci): Upload test results to Datadog (#11739)

* feat(ci): Upload test results to Datadog

Signed-off-by: Spencer Gilbert <spencer.gilbert@datadoghq.com>

* actually install the datadog-ci tool

Signed-off-by: Spencer Gilbert <spencer.gilbert@datadoghq.com>

* fix style

Signed-off-by: Spencer Gilbert <spencer.gilbert@datadoghq.com>

* try and debug windows failure

Signed-off-by: Spencer Gilbert <spencer.gilbert@datadoghq.com>

* update nextest config and update shebang

Signed-off-by: Spencer Gilbert <spencer.gilbert@datadoghq.com>

* more shebang

Signed-off-by: Spencer Gilbert <spencer.gilbert@datadoghq.com>

* forget shebangs, js is ultimate cross platform language

Signed-off-by: Spencer Gilbert <spencer.gilbert@datadoghq.com>

* one day this will work

Signed-off-by: Spencer Gilbert <spencer.gilbert@datadoghq.com>

* skip windows for now, include tags for platform and arch

Signed-off-by: Spencer Gilbert <spencer.gilbert@datadoghq.com>

* document nextest config

Signed-off-by: Spencer Gilbert <spencer.gilbert@datadoghq.com>

* link to windows issue in makefile

Signed-off-by: Spencer Gilbert <spencer.gilbert@datadoghq.com>