ci: migrate long sims

[tac0turtle]

Description

cancel ci if no .go files have been touched. There is no clean way of doing this so i opted to exit 1 on the diff job if no go files were changed and have builds depend on diff passing

• migrate proto checks to github actions

• providing make commands to use buf within docker

• test-sim-multi-seed-long migration to github actions. Follows same logic and only runs on release branches

• add protobuf section to contributing.md

[codecov]

Codecov Report

Merging #6084 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6084   +/-   ##
=======================================
  Coverage   54.57%   54.57%           
=======================================
  Files         436      436           
  Lines       26296    26296           
=======================================
  Hits        14352    14352           
  Misses      10952    10952           
  Partials      992      992           

[tac0turtle]

need to debug the proto-breakage ci