Update GitHub issue templates

.github/ISSUE_TEMPLATE/bug-report.yaml

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+name: Bug Report
+description: Report a bug encountered with Scylla Operator
+labels: kind/bug
+body:
+- type: textarea
+  id: problem
+  attributes:
+    label: What happened?
+    description: |
+      Please provide as much info as possible. Ensuring all details are shared in your report will help us address your bug in a timely manner.
+  validations:
+    required: true
+
+- type: textarea
+  id: expected
+  attributes:
+    label: What did you expect to happen?
+  validations:
+    required: true
+
+- type: textarea
+  id: repro
+  attributes:
+    label: How can we reproduce it (as minimally and precisely as possible)?
+  validations:
+    required: true
+
+- type: textarea
+  id: operatorVersion
+  attributes:
+    label: Scylla Operator version
+  validations:
+    required: true
+
+- type: textarea
+  id: kubernetesPlatform
+  attributes:
+    label: Kubernetes platform name and version
+    value: |
+      <details>
+      ```console
+      $ kubectl version
+      # paste output here
+      ```
+
+      Kubernetes platform info:
+      </details>
+  validations:
+    required: true
+
+- type: textarea
+  id: must-gather
+  attributes:
+    label: |
+      Please attach the must-gather archive. The must-gather archive is a **mandatory** part of every bug report.
+      See https://operator.docs.scylladb.com/stable/support/must-gather.html to learn how you can collect it.
+
+      Tip: You can attach images or log files by clicking this area to highlight it and then dragging files in.
+  validations:
+    required: true
+
+- type: textarea
+  id: additional
+  attributes:
+    label: Anything else we need to know?

.github/ISSUE_TEMPLATE/ci-flake.yaml

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+name: CI Flake
+description: Report CI jobs that flaked
+labels: kind/flake
+body:
+- type: textarea
+  id: jobref
+  attributes:
+    label: Link to the job that flaked.
+  validations:
+    required: true
+
+- type: textarea
+  id: details
+  attributes:
+    label: Snippet of what failed.
+    description: Insert a short snippet of what failed to have a quick preview (stack trace) and something to track even if logs are gone.
+  validations:
+    required: true

.github/ISSUE_TEMPLATE/feature-request.yaml

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+name: Feature request
+description: Create a feature request
+labels: kind/feature
+body:
+- type: textarea
+  id: expected
+  attributes:
+    label: What should the feature do?
+  validations:
+    required: true
+
+- type: textarea
+  id: expected
+  attributes:
+    label: What is the use case behind this feature?
+  validations:
+    required: true
+
+- type: textarea
+  id: additional
+  attributes:
+    label: Anything else we need to know?