Add integration tests for xDS flow control #1333

	#name: CI
	#
	#on:
	# push:
	# pull_request:
	# branches:
	# - '*'
	#concurrency:
	# group: ${{ github.workflow }}-${{ github.event.pull_request.number \|\| github.ref }}-${{ github.head_ref }}
	# cancel-in-progress: true
	#jobs:
	#
	# checkstyle:
	# name: Checkstyle
	# runs-on: ubuntu-latest
	# steps:
	# - uses: actions/checkout@v4
	# - uses: reviewdog/action-setup@v1
	# with:
	# reviewdog_version: v0.18.1
	# - name: download checkstyle
	# run: curl -o checkstyle.jar -L https://github.com/checkstyle/checkstyle/releases/download/checkstyle-8.41.1/checkstyle-8.41.1-all.jar
	# - name: checkstyle
	# env:
	# REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	# run: \|
	# java -jar checkstyle.jar -c checkstyle.xml -f xml . \| reviewdog -f=checkstyle -name="Checkstyle Check" -reporter=github-pr-check -level=error
	#
	# build:
	# runs-on: windows-latest
	# name: build
	# steps:
	# - uses: actions/checkout@v4
	# - name: Set up JDK 8
	# uses: actions/setup-java@v4
	# with:
	# java-version: '8'
	# distribution: 'adopt'
	# cache: maven
	# - name: Create License Binary Suffix
	# run: \|
	# mvn license:aggregate-add-third-party
	# - name: Build with Maven
	# run: \|
	# mvn clean package -P agent -P package -DskipTests
	# mkdir ${{ github.workspace }}/package
	# cp ${{ github.workspace }}/sermant-agent-*.tar ${{ github.workspace }}/package
	# - name: upload package
	# uses: actions/upload-artifact@v4
	# with:
	# name: sermant
	# path: ${{ github.workspace }}/package

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