Remove the remaining integration tests bash scripts (#7153)

Since #7073 for Certbot and letsencrypt/boulder@3918714 for Boulder have landed, the bash scripts that remained after certbot-ci are not useful anymore outside of Certbot.

Only remaining place is the apacheconftest-with-pebble tox target, which leverages pebble-fetch.py script to expose a running ACME server to the apache-conf-test script.

This PR refactor apacheconftest-with-pebble to use certbot-ci instead. Finally, this PR remove the remaining integration tests bash scripts, that are _common.sh, boulder-fetch.py and pebble-fetch.py.

* Disconnect common and boulder-fetch

* Prepare reconnection of apacheconftest to new pebble deployment logic

* Finish the configuration for apacheconftest

* Add executable flag to python script

* Fix shebang

* Delete pebble-fetch.sh

tox.ini

@@ -138,7 +138,6 @@ commands =
     mypy {[base]source_paths}
 
 [testenv:apacheconftest]
-#basepython = python2.7
 commands =
     {[base]pip_install} acme . certbot-apache certbot-compatibility-test
     {toxinidir}/certbot-apache/certbot_apache/tests/apache-conf-files/apache-conf-test --debian-modules
@@ -147,14 +146,8 @@ passenv =
 
 [testenv:apacheconftest-with-pebble]
 commands =
-    {toxinidir}/tests/pebble-fetch.sh
-    {[testenv:apacheconftest]commands}
-passenv =
-    HOME
-    GOPATH
-    PEBBLEPATH
-setenv =
-    SERVER=https://localhost:14000/dir
+    {[base]pip_install} acme . certbot-apache certbot-ci certbot-compatibility-test
+    {toxinidir}/certbot-apache/certbot_apache/tests/apache-conf-files/apache-conf-test-pebble.py --debian-modules
 
 [testenv:nginxroundtrip]
 commands =