sysutils/logstash7: Fix runtime with non-default USERS/GROUPS

Also:

• Respect LOGSTASH_HOME and ETCDIR substitutions in rc.d script.
• Replace RM of bundled JDK and *.bat files with EXTRACT_AFTER_ARGS=--exclude.

Approved by: blanket (fix runtime)
MFH: 2026Q1

(cherry picked from commit f5c624428d6d4ab4738395d0cbabd6bbb246c526)