Symlink default stack configs to version specific configs too

rules_haskell_tests/ghcide-stack-snapshot.yaml

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+ghcide-stack-snapshot_9.4.6.yaml

rules_haskell_tests/ghcide-stack-snapshot_9.2.8.yaml

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+resolver: lts-20.26
+packages:
+- co-log-core-0.3.2.0
+- ghcide-1.8.0.0
+- heapsize-0.3.0.1
+- hie-bios-0.11.0
+- hie-compat-0.3.0.0
+- hiedb-0.4.2.0
+- hls-graph-1.8.0.0
+- hls-plugin-api-1.5.0.0
+- implicit-hie-0.1.4.0
+- implicit-hie-cradle-0.5.0.0
+- lsp-1.6.0.0
+- lsp-test-0.14.1.0
+- retrie-1.2.1.1
+- terminal-size-0.3.3
+- git: https://github.com/tweag/cabal
+  commit: 42f04c3f639f10dc3c7981a0c663bfe08ad833cb
+  subdirs:
+  - Cabal
+
+# We drop the Win32 package from the stack snapshot so that stack considers it a toolchain library.
+# In this case we will use the Win32 provided by the compiler instead of recompiling it.
+#
+# Recompiling it should be fine for future versions of Win32,
+# but with versions <= 2.13.2.0 we encounter the following issue:
+# https://github.com/haskell/win32/issues/193
+drop-packages:
+- Win32
+
+
+# stackage lts-20.26/ghc 9.2.8 only contains Win32-2.12.0.1
+flags:
+  ansi-terminal:
+    Win32-2-13-1: false

stackage_snapshot.yaml

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+stackage_snapshot_9.4.6.yaml

stackage_snapshot_9.4.6.yaml

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+# We drop the Win32 package from the stack snapshot so that stack considers it a toolchain library.
+# In this case we will use the Win32 provided by the compiler instead of recompiling it.
+#
+# Recompiling it should be fine for future versions of Win32,
+# but with versions <= 2.13.2.0 we encounter the following issue:
+# https://github.com/haskell/win32/issues/193
+
+resolver: lts-21.11
+
+drop-packages:
+  - Win32
+
+packages:
+- git: https://github.com/tweag/cabal
+  commit: 4f8c4ab8274320c1a00992c9aa7c6559ff190fa9
+  subdirs:
+  - Cabal
+
+# See https://github.com/avdv/proto-lens#readme
+- git: https://github.com/avdv/proto-lens
+  commit: 2ab0a8d1ec1f54f3d1a0ecd1a257311389126490
+
+# support GHC 9.4 (see https://github.com/google/ghc-source-gen/pull/102)
+- git: https://github.com/google/ghc-source-gen
+  commit: 7527305ed59a47140053cf7bc87432fe1f8804d0
+
+# stackage lts-21.11/ghc 9.4.6 only contain Win32-2.12.0.1
+flags:
+  ansi-terminal:
+    Win32-2-13-1: false