Add Working Group GitHub Issue Meeting Templates

[mcleo-d]

Description

This PR adds GitHub Issue meeting templates for the following CFI working groups to allow maintainers and teams to track items that are being discussed on calls ...

1. Policy Working Group
2. Reproducible Infrastructure Working Group
3. Runtime Validation Working Group

[linux-foundation-easycla[bot]]

• :white_check_mark: login: eddie-knight / name: Eddie Knight (994d58e952f287d5f7935585b0a98d42e1d1c0ce)
• :white_check_mark: login: mcleo-d / name: James McLeod (474e73b1fda6163e1533091d4f337cc98b165dd9, 5ab604ef6ecbc15dbf18beb9dec45176a335f185, be8d0f40785cbd19bdd1cf8cadb66e10a608f971, 0deb77e27e0f4019cd026b19f2bb401d5f6334b4)
• :x: - login: @abdullahgarcia / name: Abdullah Garcia . The commit (15b3b648e61563ba21605b9ce8a1bdd1cea349f4) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.