Add tzdata-legacy to Ubuntu Resolute images

The tzdata-legacy condition in the non-chiseled Dockerfile template was
hardcoded to OS_VERSION_BASE = "noble". When Resolute (26.04) was added
for .NET 11, the condition didn't match, so tzdata-legacy was silently
dropped. This caused TimeZoneInfo.FindSystemTimeZoneById to fail for
legacy timezone IDs like 'FLE Standard Time' (Europe/Kiev).

Change the condition to install tzdata-legacy on all Ubuntu versions
except Jammy, matching the pattern already used in the chiseled template.

Fixes #7087

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: lbussell

eng/dockerfile-templates/Dockerfile.linux.install-deps

@@ -69,7 +69,7 @@
                 cat("libicu", VARIABLES[cat("libicu|", OS_VERSION_BASE)]),
                 "tzdata"
             ],
-            when(OS_VERSION_BASE = "noble", [ "tzdata-legacy" ], []))
+            when(isUbuntu && OS_VERSION_BASE != "jammy", [ "tzdata-legacy" ], []))
         )))) ^
 
     set pkgs to

src/runtime-deps/11.0/resolute/amd64/Dockerfile

@@ -19,6 +19,7 @@ RUN apt-get update \
         libssl3t64 \
         libstdc++6 \
         tzdata \
+        tzdata-legacy \
     && rm -rf /var/lib/apt/lists/*
 
 # Create a non-root user and group

src/runtime-deps/11.0/resolute/arm32v7/Dockerfile

@@ -19,6 +19,7 @@ RUN apt-get update \
         libssl3t64 \
         libstdc++6 \
         tzdata \
+        tzdata-legacy \
     && rm -rf /var/lib/apt/lists/*
 
 # Create a non-root user and group

src/runtime-deps/11.0/resolute/arm64v8/Dockerfile

@@ -19,6 +19,7 @@ RUN apt-get update \
         libssl3t64 \
         libstdc++6 \
         tzdata \
+        tzdata-legacy \
     && rm -rf /var/lib/apt/lists/*
 
 # Create a non-root user and group

tests/Microsoft.DotNet.Docker.Tests/ProductImageTests.cs

@@ -379,6 +379,12 @@ private static string GetZLibPackage(OSInfo os)
                         "icu",
                         "tzdata"
                     },
+                { OS: var os } when os == OS.ResoluteChiseled => new[]
+                    {
+                        "libicu78",
+                        "tzdata-legacy",
+                        "tzdata"
+                    },
                 { OS: var os } when os == OS.NobleChiseled => new[]
                     {
                         "libicu74",