chore: add needs-triage to issue templates (#31056)

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: kellertk

.github/ISSUE_TEMPLATE/notice.yml

@@ -1,8 +1,8 @@
 ---
 name: "❗ Notice"
-description: Post a notice for a high impact issue
+description: Post a notice for a high impact issue. Internal CDK team use only.
 title: "❗ NOTICE (module name): (short notice description)"
-labels: [p0, management/tracking]
+labels: [needs-triage, management/tracking]
 body:
   - type: dropdown
     attributes:

.github/ISSUE_TEMPLATE/region.yml

@@ -1,7 +1,7 @@
 name: New Region
-description: Register a new region.
+description: Register a new region. Internal CDK team use only.
 title: "Register new region: [region]"
-labels: ["@aws-cdk/region-info", "feature-request", "p1", "effort/medium"]
+labels: ["@aws-cdk/region-info", "feature-request", needs-triage, "effort/medium"]
 body:
   - type: input
     id: ROUTE_53_BUCKET_WEBSITE_ZONE_IDS

.github/ISSUE_TEMPLATE/tracking.yml

@@ -1,7 +1,7 @@
 name: Tracking Issue
-description: Add a module tracking issue (internal use only)
+description: Add a module tracking issue. Internal CDK team use only.
 title: "Tracking: [service]"
-labels: [management/tracking]
+labels: [needs-triage, management/tracking]
 body:
   - type: markdown
     attributes: