PHPLIB-1260: Revamp evergreen config (#1179)

* Split up evergreen config and create single build variant

* Upload built extension

* Add test variant

* Build on all platforms

* Run tests on all MongoDB versions

* Add remaining tests

* Build against latest extension branch

* Run no-auth tests

* Set PHP_VERSION expansion in test variants

* Remove sudo to fix RHEL builds

* Clean up legacy variants to account for progress

* Move Atlas Tests to new format

* Move serverless tests to new format

* Move more tests to new format

* Fix wrong output in test configuration

* Move CSFLE tests to new format

* Move ADL tests to new format

* Move lowest dependency tests to new format

* Define aliases for PR builds

* Prevent generated build files from showing diffs in pull requests

* Apply recent changes from PHPC config

This moves templates and generated files to separate folders and changes the loadbalanced tests to use its own topology instead of "sharded".

* Remove unused YAML tags

* Supply makeflags for pecl install

* Remove irrelevant functions

* Clean up variables when running scripts

* Skip CSFLE tests for all topologies

* Document environment variables for install-composer.sh

* Add missing CSFLE tag to no-aws-creds tests

Author: alcaeus

.evergreen/compile-extension.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+set -o errexit  # Exit the script with error if any of the commands fail
+
+PATH="$PHP_PATH/bin:$PATH"
+
+install_extension ()
+{
+   rm -f ${PHP_PATH}/lib/php.ini
+
+   if [ "x${EXTENSION_BRANCH}" != "x" ] || [ "x${EXTENSION_REPO}" != "x" ]; then
+      CLONE_REPO=${EXTENSION_REPO:-https://github.com/mongodb/mongo-php-driver}
+      CHECKOUT_BRANCH=${EXTENSION_BRANCH:-master}
+
+      echo "Compiling driver branch ${CHECKOUT_BRANCH} from repository ${CLONE_REPO}"
+
+      mkdir -p /tmp/compile
+      rm -rf /tmp/compile/mongo-php-driver
+      git clone ${CLONE_REPO} /tmp/compile/mongo-php-driver
+      cd /tmp/compile/mongo-php-driver
+
+      git checkout ${CHECKOUT_BRANCH}
+      git submodule update --init
+      phpize
+      ./configure --enable-mongodb-developer-flags
+      make all -j20 > /dev/null
+      make install
+
+      cd ${PROJECT_DIRECTORY}
+   elif [ "${EXTENSION_VERSION}" != "" ]; then
+      echo "Installing driver version ${EXTENSION_VERSION} from PECL"
+      MAKEFLAGS=-j20 pecl install -f mongodb-${EXTENSION_VERSION}
+   else
+      echo "Installing latest driver version from PECL"
+      MAKEFLAGS=-j20 pecl install -f mongodb
+   fi
+
+   cp ${PROJECT_DIRECTORY}/.evergreen/config/php.ini ${PHP_PATH}/lib/php.ini
+
+   php --ri mongodb
+}
+
+install_extension