Stop running upgrade testing for EOL branches

stable/2024.2 is EOL and grenade job on stable/2025.1
is testing upgrade from stable/2024.2 to stable/2025.1
which is broken.

Adding branch variant to grenade job in interated template
so that we do not run those on EOL branch upgrade testing.

Also, remove the grenade skip levle job for stable/2023.1
Change-Id: I98e0f68b69e967797880663947bd2791292039b3
Signed-off-by: Ghanshyam Maan <gmaan.os14@gmail.com>

Author: gmaanos

zuul.d/integrated-gate.yaml

@@ -485,19 +485,10 @@
     # only from master(or the branch it was meant to run).
     check:
       jobs:
-        # NOTE(gmann): These template are generic and used on stable branch
-        # as well as master testing. So grenade-skip-level on stable/2023.1
-        # which test stable/yoga to stable/2023.1 upgrade is non-voting.
-        - grenade-skip-level:
-            voting: false
-            branches:
-              - stable/2023.1
         # NOTE(gmann): Nova decided to run grenade skip level testing always
         # (on SLURP as well as non SLURP release) so we are adding grenade-skip-level-always
         # job in integrated gate and we do not need to update skip level job
         # here until Nova change the decision.
-        # This is added from 2023.2 release cycle onwards so we need to use branch variant
-        # to make sure we do not run this job on older than 2023.2 gate.
         - grenade-skip-level-always:
             branches:
               - ^.*/2024.1
@@ -543,14 +534,11 @@
       run on Placement gate only.
     check:
       jobs:
-        - grenade
-        # NOTE(gmann): These template are generic and used on stable branch
-        # as well as master testing. So grenade-skip-level on stable/2023.1
-        # which test stable/yoga to stable/2023.1 upgrade is non-voting.
-        - grenade-skip-level:
-            voting: false
+        - grenade:
             branches:
-              - stable/2023.1
+              - ^.*/2025.2
+              - ^.*/2026.1
+              - master
         # on stable/2024.1(SLURP) grenade-skip-level is voting which test
         # stable/2023.1 to stable/2024.1 upgrade. This is supposed to run on
         # SLURP release only.
@@ -577,7 +565,11 @@
               negate: true
     gate:
       jobs:
-        - grenade
+        - grenade:
+            branches:
+              - ^.*/2025.2
+              - ^.*/2026.1
+              - master
         - tempest-integrated-placement
         # on stable/2024.1(SLURP) grenade-skip-level is voting which test
         # stable/2023.1 to stable/2024.1 upgrade. This is supposed to run on
@@ -612,14 +604,11 @@
       run on Cinder and Glance gate only.
     check:
       jobs:
-        - grenade
-        # NOTE(gmann): These template are generic and used on stable branch
-        # as well as master testing. So grenade-skip-level on stable/2023.1
-        # which test stable/yoga to stable/2023.1 upgrade is non-voting.
-        - grenade-skip-level:
-            voting: false
+        - grenade:
             branches:
-              - stable/2023.1
+              - ^.*/2025.2
+              - ^.*/2026.1
+              - master
         # on stable/2024.1(SLURP) grenade-skip-level is voting which test
         # stable/2023.1 to stable/2024.1 upgrade. This is supposed to run on
         # SLURP release only.
@@ -646,7 +635,11 @@
               negate: true
     gate:
       jobs:
-        - grenade
+        - grenade:
+            branches:
+              - ^.*/2025.2
+              - ^.*/2026.1
+              - master
         # on stable/2024.1(SLURP) grenade-skip-level is voting which test
         # stable/2023.1 to stable/2024.1 upgrade. This is supposed to run on
         # SLURP release only.
@@ -681,7 +674,11 @@
       run on swift gate only.
     check:
       jobs:
-        - grenade
+        - grenade:
+            branches:
+              - ^.*/2025.2
+              - ^.*/2026.1
+              - master
         # on stable/2024.1(SLURP) grenade-skip-level is voting which test
         # stable/2023.1 to stable/2024.1 upgrade. This is supposed to run on
         # SLURP release only.
@@ -708,7 +705,11 @@
               negate: true
     gate:
       jobs:
-        - grenade
+        - grenade:
+            branches:
+              - ^.*/2025.2
+              - ^.*/2026.1
+              - master
         # on stable/2024.1(SLURP) grenade-skip-level is voting which test
         # stable/2023.1 to stable/2024.1 upgrade. This is supposed to run on
         # SLURP release only.