CompFuzzCI integration (no forks) (dafny-lang#5697)

### Description
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<!-- Is this a bug fix for an issue visible in the latest release?
Mention this in the PR details and ensure a patch release is considered
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### How has this been tested?
<!-- Tests can be added to
`Source/IntegrationTests/TestFiles/LitTests/LitTest/` or to
`Source/*.Test/…` and run with `dotnet test` -->

<small>By submitting this pull request, I confirm that my contribution
is made under the terms of the [MIT
license](https://github.com/dafny-lang/dafny/blob/master/LICENSE.txt).</small>

.github/workflows/compfuzzci_close_pr.yaml

@@ -0,0 +1,29 @@
+# This workflow is triggered on PR being closed.
+# It dispatches workflow on CompFuzzCI repository, where the bugs found in the PR head is discarded from the database.
+
+name: Updating CompFuzzCI on PR Closed
+on:
+  pull_request:
+    branches:
+      - master
+    types: [closed]
+
+jobs:
+  UpdatePRClosed:
+    if: github.event.pull_request.base.ref == 'master' && github.event.pull_request.head.repo.owner.login == 'dafny-lang'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger CompFuzzCI
+        uses: actions/github-script@v7
+        with:
+            github-token: ${{ secrets.COMPFUZZCI_PAT }}
+            script: |
+              await github.rest.actions.createWorkflowDispatch({
+                  owner: 'CompFuzzCI',
+                  repo: 'DafnyCompilerFuzzer',
+                  workflow_id: 'update_pr_close.yaml',
+                  ref: 'main',
+                  inputs: {
+                      pr_head_ref: '${{github.event.pull_request.head.ref}}' 
+                  }
+              })

.github/workflows/compfuzzci_fuzz_no_forks.yaml

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+# This workflow is triggered on PR being opened, synced, reopened, closed.
+# It dispatches workflow on CompFuzzCI repository, where fuzzing of the PR is handled.
+
+name: Fuzzing on PR (excluding forks)
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  FuzzOnPR:
+    if: github.event.pull_request.base.ref == 'master' && github.event.pull_request.head.repo.owner.login == 'dafny-lang'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger CompFuzzCI
+        uses: actions/github-script@v7
+        with:
+            github-token: ${{ secrets.COMPFUZZCI_PAT }}
+            script: |
+              await github.rest.actions.createWorkflowDispatch({
+                  owner: 'CompFuzzCI',
+                  repo: 'DafnyCompilerFuzzer',
+                  workflow_id: 'fuzz.yaml',
+                  ref: 'main',
+                  inputs: {
+                      commit: '${{ github.event.pull_request.head.sha }}',
+                      main_commit: '${{github.event.pull_request.base.sha}}',
+                      branch: '${{github.event.pull_request.head.ref}}',
+                      duration: '3600',
+                      instance: '2'
+                  }
+              })

.github/workflows/compfuzzci_process_issues.yaml

@@ -0,0 +1,51 @@
+# This workflow is triggered on issue being opened, closed, reopened.
+# The CompFuzzCI fuzzer needs to keep track of active issues in the repository to ensure that the fuzzer does not report the same issue multiple times.
+# For open and reopen events: It dispatches workflow on CompFuzzCI repository, where the issue is added to the database.
+# For close event: It dispatches workflow on CompFuzzCI repository, where the issue is removed from the database.
+
+name: Issue Update for Fuzzer
+on:
+  issues:
+    branches:
+      - master
+    types: [opened, closed, reopened]
+
+jobs:
+  UpdateIssueOpened:
+    if: github.event.action == 'opened' || github.event.action == 'reopened'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger CompFuzzCI
+        uses: actions/github-script@v7
+        with:
+            github-token: ${{ secrets.COMPFUZZCI_PAT }}
+            script: |
+              await github.rest.actions.createWorkflowDispatch({
+                  owner: 'CompFuzzCI',
+                  repo: 'DafnyCompilerFuzzer',
+                  workflow_id: 'update_issue_open.yaml',
+                  ref: 'main',
+                  inputs: {
+                      issue_number: '${{github.event.issue.number}}',
+                      issuer: '${{github.event.issue.user.login}}',
+                      commit: '${{ github.sha }}'          
+                  }
+              })
+  UpdateIssueClosed:
+    if: github.event.action == 'closed'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger CompFuzzCI
+        uses: actions/github-script@v7
+        with:
+            github-token: ${{ secrets.COMPFUZZCI_PAT }}
+            script: |
+              await github.rest.actions.createWorkflowDispatch({
+                  owner: 'CompFuzzCI',
+                  repo: 'DafnyCompilerFuzzer',
+                  workflow_id: 'update_issue_close.yaml',
+                  ref: 'main',
+                  inputs: {
+                      issue_number: '${{github.event.issue.number}}'
+                  }
+              })