Add references to new 9.0 branches in .yml files (#57463)

Author: wtgodbe

.azure/pipelines/helix-matrix.yml

@@ -13,6 +13,7 @@ schedules:
     include:
     - release/6.0
     - release/8.0
+    - release/9.0
   always: false
 
 variables:

.azure/pipelines/identitymodel-helix-matrix.yml

@@ -8,6 +8,7 @@ schedules:
     include:
     - main
     - release/8.0
+    - release/9.0
   always: true
 
 variables:

.github/dependabot.yml

@@ -86,3 +86,15 @@ updates:
     labels:
       - area-infrastructure
     target-branch: "release/8.0"
+  - package-ecosystem: "gitsubmodule"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    allow:
+      - dependency-type: "all"
+    commit-message:
+      prefix: "[release/9.0] "
+      include: scope
+    labels:
+      - area-infrastructure
+    target-branch: "release/9.0"

.github/policies/resourceManagement.yml

@@ -501,19 +501,30 @@ configuration:
           branch: main
       then:
       - addMilestone:
-          milestone: 9.0-rc1
+          milestone: 10.0-preview1
       description: '[Milestone Assignments] Assign Milestone to PRs merged to the `main` branch'
     - if:
       - payloadType: Pull_Request
       - isAction:
           action: Closed
       - targetsBranch:
-          branch: release/9.0-preview7
+          branch: release/9.0-rc1
       then:
       - removeMilestone
       - addMilestone:
-          milestone: 9.0-preview7
-      description: '[Milestone Assignments] Assign Milestone to PRs merged to release/9.0-preview7 branch'
+          milestone: 9.0-rc1
+      description: '[Milestone Assignments] Assign Milestone to PRs merged to release/9.0-rc1 branch'
+    - if:
+      - payloadType: Pull_Request
+      - isAction:
+          action: Closed
+      - targetsBranch:
+          branch: release/9.0
+      then:
+      - removeMilestone
+      - addMilestone:
+          milestone: 9.0-rc2
+      description: '[Milestone Assignments] Assign Milestone to PRs merged to release/9.0 branch'
     - if:
       - payloadType: Issues
       - isAction:
@@ -581,6 +592,21 @@ configuration:
       - addReply:
           reply: 'Hi @${issueAuthor}. We have added the "Needs: Author Feedback" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.'
       description: Add comment when 'Needs Author Feedback' is applied to issue
+    - if:
+      - payloadType: Pull_Request
+      - isAction:
+          action: Opened
+      - targetsBranch:
+          branch: release/9.0
+      then:
+      - addMilestone:
+          milestone: 9.0.x
+      - addReply:
+          reply: >-
+            Hi @${issueAuthor}. If this is not a tell-mode PR, please make sure to follow the instructions laid out in the [servicing process](https://aka.ms/aspnet/servicing) document.
+
+            Otherwise, please add `tell-mode` label.
+      description: Add release/9.0 targeting PRs to the servicing project
     - if:
       - payloadType: Pull_Request
       - isAction: