Add a faux pandoc package (for conflicts)

Add conflicting versions of pandoc to repo but not all of them as there are so many

Author: philderbeast

cabal-testsuite/PackageTests/ShortRejections/cabal.project

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+packages: .
+constraints: pandoc ==3.1.11

cabal-testsuite/PackageTests/ShortRejections/pandoc.cabal

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+cabal-version:      2.0
+name:               pandoc
+version:            999999999.0.0.0
+category:           Testing
+build-type:         Simple
+
+library
+    exposed-modules:  MyLib
+    build-depends:    base
+    hs-source-dirs:   src
+    default-language: Haskell2010

cabal-testsuite/PackageTests/ShortRejections/pandoc.out

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+# cabal v2-update
+Downloading the latest package list from test-local-repo
+# cabal v2-build
+Resolving dependencies...
+Error: cabal: Could not resolve dependencies:
+[__0] next goal: pandoc (user goal)
+[__0] rejecting: pandoc-999999999.0.0.0 (constraint from project config <ROOT>/cabal.project requires ==3.1.11)
+[__0] rejecting: pandoc-3.1.11, pandoc-3.1.10, pandoc-3.1.9, pandoc-3.1.8, pandoc-3.1.7, pandoc-3.1.6.2, pandoc-3.1.6.1, pandoc-3.1.5, pandoc-3.1.4, pandoc-3.1.3, pandoc-3.1.2, pandoc-3.1.1, pandoc-3.0.1, pandoc-3.0, pandoc-2.19.2, pandoc-2.19.1, pandoc-2.19, pandoc-2.18, pandoc-2.17.1.1, pandoc-2.17.1, pandoc-2.17.0.1, pandoc-2.17, pandoc-2.16.2, pandoc-2.16.1, pandoc-2.16, pandoc-2.15, pandoc-2.14.2, pandoc-2.14.1, pandoc-2.14.0.3, pandoc-2.14.0.2, pandoc-2.14.0.1, pandoc-2.14, pandoc-2.13, pandoc-2.12, pandoc-2.11.4, pandoc-2.11.3.2, pandoc-2.11.3.1, pandoc-2.11.3, pandoc-2.11.2, pandoc-2.11.1.1, pandoc-2.11.1, pandoc-2.11.0.4 (constraint from user target requires ==999999999.0.0.0)
+[__0] fail (backjumping, conflict set: pandoc)
+After searching the rest of the dependency tree exhaustively, these were the goals I've had most trouble fulfilling: pandoc (44)

cabal-testsuite/PackageTests/ShortRejections/pandoc.test.hs

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+import Test.Cabal.Prelude
+
+main = cabalTest . withRepo "repo" . withProjectFile "cabal.project" $ do
+    fails $ cabal "v2-build" ["all", "--dry-run"]

cabal-testsuite/PackageTests/ShortRejections/repo/pandoc-2.11.0.4/pandoc.cabal

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+module MyLib (someFunc) where
+
+someFunc :: IO ()
+someFunc = putStrLn "someFunc"