release: add release:close, rename release:publish to release:stage

Created by: bobheadxi

Closes https://github.com/sourcegraph/sourcegraph/issues/14912 with a new release:close announcement command (mostly a convenience for now, but can possibly attach more automation to this in the future)

To avoid confusion, rename release:publish to release:stage (since it just opens PRs, so is more a stage than a publish anyway)

Created by: codecov[bot]

Codecov Report

Merging #15152 into main will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #15152      +/-   ##
==========================================
- Coverage   52.59%   52.59%   -0.01%     
==========================================
  Files        1611     1611              
  Lines       80517    80517              
  Branches     7001     6958      -43     
==========================================
- Hits        42346    42345       -1     
  Misses      34340    34340              
- Partials     3831     3832       +1     

Flag	Coverage Δ
#go	52.55% <ø> (-0.01%)
#integration	30.44% <ø> (+0.02%)
#storybook	26.12% <ø> (ø)
#typescript	52.67% <ø> (+<0.01%)
#unit	34.29% <ø> (ø)

Impacted Files	Coverage Δ
.../internal/codeintel/resolvers/graphql/locations.go	83.50% <0.00%> (-2.07%)
...t/web/src/search/input/interactive/FilterInput.tsx	89.61% <0.00%> (+0.64%)