RFR: 8329948: Remove string template feature

[Maurizio Cimadamore]

This PR removes support for the string template feature from the Java compiler and the Java SE API, as discussed here:

https://mail.openjdk.org/pipermail/amber-spec-experts/2024-April/004106.html

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Commit messages:
 - Drop spurious changes
 - Merge branch 'master' into template_removal
 - Drop string templates

Changes: https://git.openjdk.org/jdk/pull/18688/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18688&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329948
  Stats: 7402 lines in 67 files changed: 135 ins; 7208 del; 59 mod
  Patch: https://git.openjdk.org/jdk/pull/18688.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18688/head:pull/18688

PR: https://git.openjdk.org/jdk/pull/18688