Cherry-pick commits from #707 (#710)

* Increase age tracer limit to 1000000 years to avoid reseting when changing restart date

* Updated checksums as part of https://github.com/ACCESS-NRI/access-esm1.6-configs/actions/runs/24720144818

---------

Co-authored-by: Spencer Wong <spencer.wong@anu.edu.au>
Co-authored-by: access-bot <113399144+access-bot@users.noreply.github.com>

Author: 3 people

ocean/input.nml

@@ -509,7 +509,7 @@
       remap_depth_to_s_init=.false.
       zero_tracer_source=.false.
       limit_age_tracer=.true.
-      age_tracer_max_init=0.
+      age_tracer_max_init=1000000
       frazil_heating_after_vphysics=.true.
       frazil_heating_before_vphysics=.false.
 /

testing/checksum/historical-24hr-checksum.json

@@ -217,7 +217,7 @@
       "-289258899488499500"
     ],
     "age_global": [
-      "3105357863725519231"
+      "3105372778874296665"
     ],
     "frazil": [
       "-4194538853639281024"