[code-reflection] RFR: Uncomment a String Template Test

[Mourad Abbay]

A test of String Template was commented because the code uses wildcard type that's not yet modeled., but the produced IR can still be interpreted or lowered to bytecode then executed without issues, so we can test against what the compiler generates for now .

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Commit messages:
 - Uncomment a String Template Test

Changes: https://git.openjdk.org/babylon/pull/43/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=43&range=00
  Stats: 20 lines in 1 file changed: 0 ins; 4 del; 16 mod
  Patch: https://git.openjdk.org/babylon/pull/43.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/43/head:pull/43

PR: https://git.openjdk.org/babylon/pull/43