Decommission obsolete ANGLE trybots

Main reason is to repurpose the VMs used by mac_angle_dbg_ng.
Drive by decommissioning:
linux_angle_dbg_ng
win_angle_dbg_ng
win_angle_x64_rel_ng
win_angle_x64_dbg_ng
win_angle_x64_deqp_rel_ng

Manual GPU trybots provide a better substitute for this functionality.

Also removing some builders which were never used:
linux_angle_compile_dbg_ng
mac_angle_compile_dbg_ng
win_angle_compile_x64_rel_ng
win_angle_compile_x64_dbg_ng
win_angle_compile_dbg_ng

Bug: 935718
Change-Id: I3871f4dceb12af35b55c3317869a71ca66e14938
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1581983
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653684}
3 files changed