Remove unnecassary calls to filepath.Join

[Gusted]

• Partialy resolvess Tracking issue: Updating golangci-lint #17596
• Resolves badCall errors from go-critic badCall: suspicious Join on 1 argument
• When only 1 argument is passed into filepath.Join, it won't do anything special other than filepath.Clean(...) will be applied over it.

All but 1 filepath.Join() with 1 argument was completely removed, as they those arguments were already coming from functions or variables that already did filepath.Join() with multiple arguments, thus completely useless to pass it again into filepath.Join().

[codecov-commenter]

Codecov Report

Merging #17608 (73f3298) into main (83a04e4) will decrease coverage by 0.00%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##             main   #17608      +/-   ##
==========================================
- Coverage   45.48%   45.48%   -0.01%     
==========================================
  Files         799      799              
  Lines       88961    88961              
==========================================
- Hits        40462    40461       -1     
+ Misses      42002    42001       -1     
- Partials     6497     6499       +2     

Impacted Files	Coverage Δ
modules/repository/adopt.go	0.00% <0.00%> (ø)
routers/web/user/setting/adopt.go	0.00% <0.00%> (ø)
routers/web/user/setting/profile.go	38.22% <0.00%> (ø)
services/pull/merge.go	49.87% <100.00%> (ø)
modules/notification/mail/mail.go	35.29% <0.00%> (-2.95%)	⬇️
modules/log/event.go	60.64% <0.00%> (-1.86%)	⬇️
modules/notification/ui/ui.go	60.86% <0.00%> (-1.45%)	⬇️
models/notification.go	64.71% <0.00%> (-0.87%)	⬇️
models/issue_comment.go	52.48% <0.00%> (ø)
modules/queue/queue_bytefifo.go	59.88% <0.00%> (+0.59%)	⬆️
... and 2 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 10db864...73f3298. Read the comment docs.

[lunny]

make L-G-T-M work.