Add compatibility workflows and integration tests (#1991)

Fixes #1986
Fixes #1994

- Updated .gitignore to include SSL certificate files.
- Introduced new GitHub Actions workflows for testing compatibility with
Zabbix versions 5.0, 6.0, 7.0, and 7.2.
- Added integration tests for Zabbix API for each version, ensuring
proper authentication and API version handling.
- Updated Docker Compose files to support SSL configuration for Zabbix
web services.
- Removed deprecated default Docker Compose and bootstrap files.
- Removed devenv for version 6.2.

.gitignore

@@ -51,3 +51,7 @@ alexanderzobnin-zabbix-app.zip
 public/css/*.min.css
 
 provisioning/
+
+# SSL certificates
+devenv/nginx/nginx.crt
+devenv/nginx/nginx.key