chore: create issue template & workflow to automatically open issue for browser testing dependencies updates (Selenium / Playwright)

.github/workflows/browsertesting-issue-body.md

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+## Description
+
+Selenium is used in the aspnetcore repo for automated E2E integration testing.
+Playwright is used in the aspnetcore repo for some benchmarking apps. We need to ensure the docker file and the package version match.
+
+## Instructions
+
+To update the Selenium and Playwright versions, these files need to be updated:
+
+### Packages
+  - [ ] [Selenium in `Versions.props`](eng/Versions.props) from NuGet:
+    - [ ] [Selenium.WebDriver](https://www.nuget.org/packages/Selenium.WebDriver/) (Config variable `SeleniumWebDriverVersion`)
+    - [ ] [Selenium.Support](https://www.nuget.org/packages/Selenium.Support/) (Config variable `SeleniumSupportVersion`)
+  - [ ] Ensure Playwright versions match
+    - [ ]  [Blazor Wasm benchmarks in `src/Components/benchmarkapps/Wasm.Performance/dockerfile`](src/Components/benchmarkapps/Wasm.Performance/dockerfile) (image starts with `mcr.microsoft.com`)
+    - [ ]  [Playwright package version](eng/Versions.props) (Config variable `PlaywrightVersion`)
+
+## Actions
+
+Please, open the PR against `main` branch and include changes to the files listed above.
+Also mention @dotnet/aspnet-build in the opened Pull Request - this will be a responsible engineer for changes validation.

.github/workflows/browsertesting-open-issue.yml

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+name: "[Monthly] Schedule Browser-Testing Dependencies Update Issue"
+
+on:
+  schedule:
+    # Runs on the first day of every month at midnight UTC
+    - cron: '0 0 1 * *'
+  workflow_dispatch: # for manual triggering
+
+jobs:
+  create-issue:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      # copilot can be assigned to the issue
+      # https://cli.github.com/manual/gh_issue_create
+      - name: Create Issue From Template
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_REPO: ${{ github.repository }}
+        run: |
+          gh issue create \
+            --title "Request Browser-Testing Dependencies Update" \
+            --body-file ".github/workflows/browsertesting-issue-body.md" \
+            --assignee "@copilot"