gh-109408: Remove `.azure-pipelines/pr.yml` (#122643)

This no longer does anything useful, beyond wasting Azure resources.

.azure-pipelines/posix-deps-apt.sh

@@ -1,27 +0,0 @@
-#!/bin/sh
-apt-get update
-
-apt-get -yq install \
-    build-essential \
-    zlib1g-dev \
-    libbz2-dev \
-    liblzma-dev \
-    libncurses5-dev \
-    libreadline6-dev \
-    libsqlite3-dev \
-    libssl-dev \
-    libgdbm-dev \
-    tk-dev \
-    lzma \
-    lzma-dev \
-    liblzma-dev \
-    libffi-dev \
-    uuid-dev \
-    xvfb
-
-if [ ! -z "$1" ]
-then
-  echo ##vso[task.prependpath]$PWD/multissl/openssl/$1
-  echo ##vso[task.setvariable variable=OPENSSL_DIR]$PWD/multissl/openssl/$1
-  python3 Tools/ssl/multissltests.py --steps=library --base-directory $PWD/multissl --openssl $1 --system Linux
-fi

.azure-pipelines/posix-steps.yml

@@ -1,20 +0,0 @@
-steps:
-- checkout: self
-  clean: true
-  fetchDepth: 5
-
-# Work around a known issue affecting Ubuntu VMs on Pipelines
-- script: sudo setfacl -Rb /home/vsts
-  displayName: 'Workaround ACL issue'
-
-- script: sudo ./.azure-pipelines/posix-deps-apt.sh $(openssl_version)
-  displayName: 'Install dependencies'
-
-- script: ./configure --with-pydebug
-  displayName: 'Configure CPython (debug)'
-
-- script: make -j4
-  displayName: 'Build CPython'
-
-- script: make pythoninfo
-  displayName: 'Display build info'

.azure-pipelines/pr.yml

@@ -1,11 +0,0 @@
-pr: ['main', '3.12', '3.11', '3.10', '3.9', '3.8', '3.7']
-
-jobs:
-- job: Prebuild
-  displayName: Pre-build checks
-
-  pool:
-    vmImage: ubuntu-22.04
-
-  steps:
-  - template: ./prebuild-checks.yml