chore: add telemetry reminder if meeting type/feature (#19359)

Co-authored-by: tabversion <[email protected]>
Co-authored-by: Chengyou Liu <[email protected]>

.github/label-commenter-config.yml

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+comment:
+  header: Hi, there.
+  footer: "\
+    ---\n\n\
+    > This is an automated comment created by the [peaceiris/actions-label-commenter]. \
+    Responding to the bot or mentioning it won't have any effect.\n\n\
+    [peaceiris/actions-label-commenter]: https://github.com/peaceiris/actions-label-commenter"
+
+labels:
+  - name: 'user-facing-changes'
+    labeled:
+      pr:
+        body: |
+          :memo: **Telemetry Reminder**:
+          If you're implementing this feature, please consider adding telemetry metrics to track its usage. This helps us understand how the feature is being used and improve it further.
+          You can find the function `report_event` of telemetry reporting in the following files. Feel free to ask questions if you need any guidance!
+          * `src/frontend/src/telemetry.rs`
+          * `src/meta/src/telemetry.rs`
+          * `src/stream/src/telemetry.rs`
+          * `src/storage/compactor/src/telemetry.rs`
+          Or calling `report_event_common` (`src/common/telemetry_event/src/lib.rs`) as if finding it hard to implement.
+          :sparkles: Thank you for your contribution to RisingWave! :sparkles:

.github/workflows/label-triggered.yml

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+name: Label Triggered Comment
+
+on:
+  issues:
+    types: [labeled, unlabeled]
+  pull_request:
+    types: [labeled, unlabeled]
+
+permissions:
+  contents: read
+  issues: write
+  pull-requests: write
+
+jobs:
+  comment:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: Label Commenter
+        uses: peaceiris/actions-label-commenter@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          config_file: .github/label-commenter-config.yml