Replace list.List with slices

[KN4CK3R]

This PR replaces all list.Lists with typed slices. There was not a single place where a linked list has advantages.

For

gitea/models/issue_comment.go

Line 1336 in 0966349

func commitBranchCheck(gitRepo *git.Repository, startCommit *git.Commit, endCommitID, baseBranch string, commitList map[string]commitBranchCheckItem) (err error) {

I'm not sure if the LIFO list was important but I don't think so.

[codecov-commenter]

Codecov Report

Merging #16311 (32f8cfb) into main (eaa791b) will decrease coverage by 0.02%.
The diff coverage is 80.91%.

@@            Coverage Diff             @@
##             main   #16311      +/-   ##
==========================================
- Coverage   45.39%   45.37%   -0.03%     
==========================================
  Files         756      757       +1     
  Lines       85279    85194      -85     
==========================================
- Hits        38712    38656      -56     
+ Misses      40305    40279      -26     
+ Partials     6262     6259       -3     

Impacted Files	Coverage Δ
modules/templates/helper.go	51.54% <ø> (-0.54%)	⬇️
routers/web/repo/blame.go	0.00% <0.00%> (ø)
routers/web/repo/wiki.go	41.62% <0.00%> (+0.20%)	⬆️
services/mirror/mirror_pull.go	32.74% <0.00%> (ø)
services/pull/pull.go	42.19% <64.28%> (+0.45%)	⬆️
modules/git/repo_commit.go	42.35% <72.22%> (-0.26%)	⬇️
routers/web/repo/commit.go	27.62% <75.00%> (-1.33%)	⬇️
modules/git/commit.go	60.00% <80.00%> (ø)
models/issue_comment.go	51.40% <83.33%> (-1.18%)	⬇️
routers/web/repo/pull.go	30.02% <85.71%> (-0.31%)	⬇️
... and 18 more

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