Compare SSH_DOMAIN when parsing submodule URLs

[mrsdizzie]

Right now we only compare the hostname from a submodule with the prefixURL it is viewed from to check if the submodule is hosted on the same Gitea instance. This adds an additional check to compare it against SSH_DOMAIN as well since the same Gitea instance might have a different hostname for SSH and if the submodule uses that hostname we should also detect that and link to the proper DOMAIN value.

Fixes: #12747, #9756

[codecov-commenter]

Codecov Report

Merging #12753 into master will decrease coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master   #12753      +/-   ##
==========================================
- Coverage   43.30%   43.28%   -0.02%     
==========================================
  Files         647      647              
  Lines       71799    71800       +1     
==========================================
- Hits        31089    31078      -11     
- Misses      35672    35682      +10     
- Partials     5038     5040       +2     

Impacted Files	Coverage Δ
modules/git/submodule.go	74.00% <60.00%> (ø)
routers/repo/view.go	38.11% <100.00%> (+0.13%)	⬆️
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
modules/process/manager.go	72.50% <0.00%> (-2.50%)	⬇️
services/pull/check.go	47.69% <0.00%> (-2.31%)	⬇️
modules/log/event.go	57.54% <0.00%> (-1.89%)	⬇️
modules/queue/unique_queue_disk_channel.go	53.84% <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	41.57% <0.00%> (ø)
... and 2 more

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