RFR: 8371130: Remove String template leftovers

[Jonas Norlinder]

Hi all,

This is a trivial removal of methods that is no longer needed due since the String template function is now removed [JDK-8329948](https://bugs.openjdk.org/browse/JDK-8329948).

Testing: tier1-2.

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Commit messages:
 - Remove leftovers

Changes: https://git.openjdk.org/jdk/pull/28125/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28125&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371130
  Stats: 36 lines in 1 file changed: 0 ins; 36 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/28125.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28125/head:pull/28125

PR: https://git.openjdk.org/jdk/pull/28125