[Issue] Allow use of CIDR ranges in maintenance allow list

[m2-assistant[bot]]

This issue is automatically created based on existing pull request: magento/magento2#30699: Allow use of CIDR ranges in maintenance allow list

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Description

The current maintenance mode allow IP list only permits individual addresses to be allowed to bypass maintenance mode. This pull request expands this to allow ranges in CIDR format.

Related Pull Requests

https://github.com/magento/partners-magento2ee/pull/407

Fixed Issues

1. Fixes https://github.com/magento/community-features/issues/233

Manual testing scenarios

1. Enable maintenance mode with php bin/magento maintenance:enable
2. Allow individual IP address, eg php bin/magento maintenance:allow-ips --add 192.168.10.180
3. Allow multiple individual IP addresses, eg php bin/magento maintenance:allow-ips --add 192.168.10.170 192.168.10.190
4. Allow range of IP addresses, eg php bin/magento maintenance:allow-ips --add 192.168.10.160/27
5. Allow IPv4 & IPv6 addresses, eg php bin/magento maintenance:allow-ips --add 192.168.46.0/24 fd12:3456:789a:1::1/64

Questions or comments

None

Contribution checklist (*)

• [x] Pull request has a meaningful description of its purpose
• [x] All commits are accompanied by meaningful commit messages
• [x] All new or changed code is covered with unit/integration tests (if applicable)
• [x] All automated tests passed successfully (all builds are green)

[github-jira-sync-bot]

:white_check_mark: Jira issue https://jira.corp.adobe.com/browse/AC-9432 is successfully created for this GitHub issue.

[m2-assistant[bot]]

:white_check_mark: Confirmed by @engcom-Lima. Thank you for verifying the issue.
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