[TASK] Streamline Build/Scripts/runTests.sh (#101)

Following the scheme provided by @sbuerk

This change modifies the `Build/Scripts/runTests.sh`
execution wrapper to be in line with current TYPO3
core implementation.

This contains following tasks:

* Modify `Build/Scripts/runTests.sh`:
    * `-b <container-binary>` switch to determine which
      container binary should be used.
    * Remove the usage of `docker-compose.yml` file and
      usage by replacing container execution call with
      docker or podman binary calls.
    * Include `bash trap` logic for container/network
      cleanup on abort signals.
    * Keep core `xdebug` flag ability, albeit not used
      currently due to not having tests included.
* Refactor suit command execution without docker-compose.
* Remove `Build/testing-docker/docker-compose.yml` due
  to being obsolete now.
* Add composer related temporary files to `.gitignore`.
* Add documentation rendering and test rendering to the
  `runTests.sh`.

.ddev/.gitignore

@@ -34,8 +34,8 @@
 /providers/upsun.yaml
 /sequelpro.spf
 /settings/settings.ddev.py
-/traefik/config/ddev-test.yaml
-/traefik/certs/ddev-test.crt
-/traefik/certs/ddev-test.key
+/traefik/config/reference-tsconfig.yaml
+/traefik/certs/reference-tsconfig.crt
+/traefik/certs/reference-tsconfig.key
 /xhprof/xhprof_prepend.php
 /**/README.*

.gitignore

@@ -33,3 +33,4 @@ nbproject
 Thumbs.db
 var/
 .cache/
+/composer.json.testing