Bug 35504: Distinguish different RMaint and Topic Expert roles

Bug 35504: Distinguish different RMaint and Topic Expert roles

This patch further splits up release maintanence and topic expert roles
so that they display with further, more accurate, detail in the
development team section.

Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit 2ce83fc784ad8bc716bd65f14845141097c72b69)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 6f09a31a153fb0d495d84ea37d63fcdd8c887674)
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>