sysutils/slurm-wlm: Added task/pgid plugin and injected it into Build process to replace cgroups

[rikka.goering_outlook.de]

Summary

• Adds files/extra-pgid/task_pgid.c
• Injects the plugin into the build process using the ports Makefile
• Adds files/patch-src_plugins_task_Makefile.in to help injection of the plugin into the build process
• QA: poudriere 14.3-amd64 OK; portlint clean; runtime basic OK

PR: 288668
Maintainer: [e-mail]

Test Plan

poudriere 14.3-amd64 OK; portlint clean; runtime: slurmctld+slurmd start and task/pgid Plugin is available

[rikka.goering_outlook.de]

• Moved Makefile hooks into dedicated patch files, according to committer suggestion (see PR: 288668)

Updating D52143: sysutils/slurm-wlm: Added task/pgid plugin and injected it into Build process to replace cgroups

Differential Revision: https://reviews.freebsd.org/D52143