Add test failing and flaking issue templates

.github/ISSUE_TEMPLATE/failing-test.yaml

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+name: Failing Test
+description: Report continuously failing tests or jobs in Metal3 CI
+body:
+  - type: textarea
+    id: jobs
+    attributes:
+      label: Which jobs are failing?
+      placeholder: |
+        Please only use this template for submitting reports about continuously failing tests or jobs in Metal3 CI.
+    validations:
+      required: true
+
+  - type: textarea
+    id: tests
+    attributes:
+      label: Which tests are failing?
+    validations:
+      required: true
+
+  - type: textarea
+    id: since
+    attributes:
+      label: Since when has it been failing?
+    validations:
+      required: true
+
+  - type: input
+    id: Jenkins
+    attributes:
+      label: Jenkins link
+
+  - type: textarea
+    id: reason
+    attributes:
+      label: Reason for failure (if possible)
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Anything else we need to know?
+
+  - type: textarea
+    id: templateLabel
+    attributes:
+      label: Label(s) to be applied
+      value: |
+        /kind failing-test
+        One or more /area label. See https://github.com/metal3-io/cluster-api-provider-metal3/labels for the list of labels.

.github/ISSUE_TEMPLATE/flaking-test.yaml

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+name: Flaking Test
+description: Report flaky tests or jobs in Metal3 CI
+body:
+  - type: textarea
+    id: jobs
+    attributes:
+      label: Which jobs are flaking?
+      description: |
+        Please only use this template for submitting reports about flaky tests or jobs (pass or fail with no underlying change in code) in Metal3 CI.
+    validations:
+      required: true
+
+  - type: textarea
+    id: tests
+    attributes:
+      label: Which tests are flaking?
+    validations:
+      required: true
+
+  - type: textarea
+    id: since
+    attributes:
+      label: Since when has it been flaking?
+    validations:
+      required: true
+
+  - type: input
+    id: Jenkins
+    attributes:
+      label: Jenkins link
+
+  - type: textarea
+    id: reason
+    attributes:
+      label: Reason for failure (if possible)
+
+  - type: textarea
+    id: additional
+    attributes:
+      label: Anything else we need to know?
+
+ - type: textarea
+    id: templateLabel
+    attributes:
+      label: Label(s) to be applied
+      value: |
+        /kind flake
+        One or more /area label. See https://github.com/metal3-io/cluster-api-provider-metal3/labels for the list of labels.