random operations test (#10986)

## Problem
We need to test the stability of Neon.

## Summary of changes
The test runs random operations on a Neon project. It performs via the
Public API calls the following operations: `create a branch`, `delete a
branch`, `add a read-only endpoint`, `delete a read-only endpoint`,
`restore a branch to a random position in the past`. All the branches
and endpoints are loaded with `pgbench`.

---------

Co-authored-by: Peter Bendel <peterbendel@neon.tech>
Co-authored-by: Alexander Bayandin <alexander@neon.tech>

.github/workflows/random-ops-test.yml

@@ -0,0 +1,93 @@
+name: Random Operations Test
+
+on:
+  schedule:
+    # * is a special character in YAML so you have to quote this string
+    #          ┌───────────── minute (0 - 59)
+    #          │  ┌───────────── hour (0 - 23)
+    #          │  │  ┌───────────── day of the month (1 - 31)
+    #          │  │  │ ┌───────────── month (1 - 12 or JAN-DEC)
+    #          │  │  │ │ ┌───────────── day of the week (0 - 6 or SUN-SAT)
+    - cron:  '23 */2 * * *' # runs every 2 hours
+  workflow_dispatch:
+    inputs:
+      random_seed:
+        type: number
+        description: 'The random seed'
+        required: false
+        default: 0
+      num_operations:
+        type: number
+        description: "The number of operations to test"
+        default: 250
+
+defaults:
+  run:
+    shell: bash -euxo pipefail {0}
+
+permissions: {}
+
+env:
+  DEFAULT_PG_VERSION: 16
+  PLATFORM: neon-captest-new
+  AWS_DEFAULT_REGION: eu-central-1
+
+jobs:
+  run-random-rests:
+    env:
+      POSTGRES_DISTRIB_DIR: /tmp/neon/pg_install
+    runs-on: small
+    permissions:
+      id-token: write
+      statuses: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        pg-version: [16, 17]
+
+    container:
+      image: ghcr.io/neondatabase/build-tools:pinned-bookworm
+      credentials:
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+      options: --init
+    steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@4d991eb9b905ef189e4c376166672c3f2f230481 # v2.11.0
+        with:
+          egress-policy: audit
+
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+
+      - name: Download Neon artifact
+        uses: ./.github/actions/download
+        with:
+          name: neon-${{ runner.os }}-${{ runner.arch }}-release-artifact
+          path: /tmp/neon/
+          prefix: latest
+          aws-oicd-role-arn: ${{ vars.DEV_AWS_OIDC_ROLE_ARN }}
+
+      - name: Run tests
+        uses: ./.github/actions/run-python-test-set
+        with:
+          build_type: remote
+          test_selection: random_ops
+          run_in_parallel: false
+          extra_params: -m remote_cluster
+          pg_version: ${{ matrix.pg-version }}
+          aws-oicd-role-arn: ${{ vars.DEV_AWS_OIDC_ROLE_ARN }}
+        env:
+          NEON_API_KEY: ${{ secrets.NEON_STAGING_API_KEY }}
+          RANDOM_SEED: ${{ inputs.random_seed }}
+          NUM_OPERATIONS: ${{ inputs.num_operations }}
+
+      - name: Create Allure report
+        if: ${{ !cancelled() }}
+        id: create-allure-report
+        uses: ./.github/actions/allure-report-generate
+        with:
+          store-test-results-into-db: true
+          aws-oicd-role-arn: ${{ vars.DEV_AWS_OIDC_ROLE_ARN }}
+        env:
+          REGRESS_TEST_RESULT_CONNSTR_NEW: ${{ secrets.REGRESS_TEST_RESULT_CONNSTR_NEW }}