Remove 2025.2 (Flamingo) ubuntu jobs

Incorrectly got added in [1], and were originally dropped
in [2].

[1] https://review.opendev.org/962239
[2] https://review.opendev.org/946545

Change-Id: Ifd88c8180866f98ca15ff2d19dd9f268eb81b7b9
Signed-off-by: Yatin Karel <ykarel@redhat.com>
2 files changed