fix: uBlue OS should be detected as FedoraImmutable (#1043)

* refactor(parse_os_release): Don't rely on specific `ID`s for Fedora Immutable

Instead match `ID=fedora` or `ID_LIKE=fedora` and decide wether or not
the distro is immutable by `VARIANT`.

* feat: add aurora,bluefin,coreos support

The `os_release`s came from the following images:

- ghcr.io/ublue-os/aurora:93f0fd9f20b3
- ghcr.io/ublue-os/bluefin:5d37394a5d4b
- ghcr.io/ublue-os/ucore:63cd1200c344

* fix: bazzite should be detected as FedoraImmutable

* squash me: cargo fmt

---------

Co-authored-by: Steve Lau <stevelauc@outlook.com>

src/steps/os/os_release/coreos

@@ -0,0 +1,23 @@
+NAME="Fedora Linux"
+VERSION="41.20250117.3.0 (CoreOS)"
+RELEASE_TYPE=stable
+ID=fedora
+VERSION_ID=41
+VERSION_CODENAME=""
+PLATFORM_ID="platform:f41"
+PRETTY_NAME="Fedora CoreOS 41.20250117.3.0 (uCore)"
+ANSI_COLOR="0;38;2;60;110;180"
+LOGO=fedora-logo-icon
+CPE_NAME="cpe:/o:fedoraproject:fedora:41"
+HOME_URL="https://getfedora.org/coreos/"
+DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora-coreos/"
+SUPPORT_URL="https://github.com/coreos/fedora-coreos-tracker/"
+BUG_REPORT_URL="https://github.com/coreos/fedora-coreos-tracker/"
+REDHAT_BUGZILLA_PRODUCT="Fedora"
+REDHAT_BUGZILLA_PRODUCT_VERSION=41
+REDHAT_SUPPORT_PRODUCT="Fedora"
+REDHAT_SUPPORT_PRODUCT_VERSION=41
+SUPPORT_END=2025-12-15
+VARIANT="CoreOS"
+VARIANT_ID=coreos
+OSTREE_VERSION='41.20250117.3.0'