Display update information of individual components only if we are not running in a Docker container

[yubiuser]

What does this PR aim to accomplish?:

Ports some v5 logic to v6.

web/scripts/pi-hole/php/update_checker.php

Lines 82 to 100 in 5c8945c

	// Version comparison
	if ($docker_current) {
	// It's a container: do not check for individual component updates
	if ($docker_current == 'nightly' || $docker_current == 'dev') {
	// Special container - no update messages
	$docker_update = false;
	} else {
	$docker_update = checkUpdate($docker_current, $docker_latest);
	}
	} else {
	// Components comparison
	$core_update = checkUpdate($core_current, $core_latest);
	$web_update = checkUpdate($web_current, $web_latest);
	$FTL_update = checkUpdate($FTL_current, $FTL_latest);
	// Not a docker container
	$docker_update = false;
	}
	}

Mitigates https://discourse.pi-hole.net/t/v6-docker-not-updating/73670

---

By submitting this pull request, I confirm the following:

1. I have read and understood the contributors guide, as well as this entire template. I understand which branch to base my commits and Pull Requests against.
2. I have commented my proposed changes within the code and I have tested my changes.
3. I am willing to help maintain this change if there are issues with it later.
4. It is compatible with the EUPL 1.2 license
5. I have squashed any insignificant commits. (git rebase)
6. I have checked that another pull request for this purpose does not exist.
7. I have considered, and confirmed that this submission will be valuable to others.
8. I accept that this submission may not be used, and the pull request closed at the will of the maintainer.
9. I give this submission freely, and claim no ownership to its content.

---

• I have read the above and my PR is ready for review. Check this box to confirm

Copilot reviewed 1 out of 1 changed files in this pull request and generated no suggestions.