Replace Java String Templates; either (probably) with simple String Concatenation [or real Template Engine, but... why?]

[vorburger]

See https://bugs.openjdk.org/browse/JDK-8329949

Noticed from google/google-java-format@fdf4b29

[vorburger]

https://github.com/jstachio/jstachio

[vorburger]

This will also unblock upgrading google-java-formatter from 1.21.0 to 1.24.0; that's currently blocked due to this failure:

java/dev/enola/web/ThingUI.java:85:50: error: did not generate token "."
            sb.append(STR."<td class=\"label\">\{link(nameValue.getKey())}</td>");
                                                 ^
tools/hello/src/main/java/dev/enola/common/hello/Hello.java:30:30: error: did not generate token "."
        return STR."hello, \{planet}";
                             ^
tools/hello/src/main/java/dev/enola/common/hello/Library.java:24:30: error: did not generate token "."
        return STR."hello, \{planet}";
                             ^