ci/lava: Improve exception handling

Move exceptions to its own file.
Create MesaCITimeoutError and MesaCIRetryError with specific exception
data for better exception classification.
Avoid the use of `fatal_err` in favor of raising a proper exception.
Make _call_proxy exception handling exhaustive, add missing
ResponseError treatment.

Also, detect JobError during job result parsing. So when a LAVA timeout error
happens, it is probably cause by some boot/network issues with a
specific device, we can retry the same job in other device with the same
device_type.

Signed-off-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15938>

.gitlab-ci/lava/exceptions.py

@@ -0,0 +1,17 @@
+from datetime import timedelta
+
+
+class MesaCIException(Exception):
+    pass
+
+
+class MesaCITimeoutError(MesaCIException):
+    def __init__(self, *args, timeout_duration: timedelta) -> None:
+        super().__init__(*args)
+        self.timeout_duration = timeout_duration
+
+
+class MesaCIRetryError(MesaCIException):
+    def __init__(self, *args, retry_count: int) -> None:
+        super().__init__(*args)
+        self.retry_count = retry_count