Rename forge-id to forge-remote-id

[anbraten]

preparation for #1417

I want to use forge-id for the id of the correspondig forge of a repo. Therefore I would like to rename ForgeID to ForgeRemoteID. (Tell me if there is a better name for it).

[codecov-commenter]

Codecov Report

Base: 42.39% // Head: 42.38% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (ff0b3c1) compared to base (023d03d).
Patch coverage: 77.44% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1418      +/-   ##
==========================================
- Coverage   42.39%   42.38%   -0.01%     
==========================================
  Files         152      153       +1     
  Lines       10474    10479       +5     
==========================================
+ Hits         4440     4442       +2     
- Misses       5755     5757       +2     
- Partials      279      280       +1     

Impacted Files	Coverage Δ
server/forge/bitbucketserver/bitbucketserver.go	0.00% <0.00%> (ø)
server/model/repo.go	0.00% <0.00%> (ø)
server/store/datastore/migration/migration.go	36.00% <ø> (ø)
server/forge/bitbucket/bitbucket.go	84.30% <33.33%> (ø)
server/forge/gitlab/gitlab.go	21.97% <37.93%> (ø)
...igration/013_rename_forge_id_to_forge_remote_id.go	40.00% <40.00%> (ø)
server/forge/github/github.go	15.89% <50.00%> (ø)
server/store/datastore/repo.go	53.33% <83.33%> (ø)
server/forge/bitbucket/convert.go	100.00% <100.00%> (ø)
server/forge/bitbucketserver/convert.go	85.52% <100.00%> (ø)
... and 8 more

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[qwerty287]

I'm fine with it.