GitLab Migration: Normalize Labels Color

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close #12779

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to test this case use, just migrate labels of https://gitlab.com/fdroid/fdroid-website

[codecov-commenter]

Codecov Report

Merging #12793 into master will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master   #12793      +/-   ##
==========================================
- Coverage   43.23%   43.23%   -0.01%     
==========================================
  Files         650      650              
  Lines       72041    72050       +9     
==========================================
  Hits        31150    31150              
- Misses      35844    35856      +12     
+ Partials     5047     5044       -3     

Impacted Files	Coverage Δ
modules/migrations/gitlab.go	1.04% <0.00%> (-0.03%)	⬇️
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
models/unit.go	46.57% <0.00%> (-2.74%)	⬇️
services/pull/check.go	48.46% <0.00%> (-1.54%)	⬇️
models/error.go	34.81% <0.00%> (-0.52%)	⬇️
models/issue_comment.go	53.75% <0.00%> (-0.16%)	⬇️
services/pull/pull.go	42.03% <0.00%> (+0.46%)	⬆️
models/gpg_key.go	55.40% <0.00%> (+0.58%)	⬆️
modules/indexer/stats/queue.go	76.47% <0.00%> (+11.76%)	⬆️
modules/indexer/stats/db.go	60.86% <0.00%> (+17.39%)	⬆️

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