Refactor server/pubsub into interface

[6543]

refactor our pubsub into an interface and now publish and listen to topics instead of label filtering.

we also now have the key const and key genaration of repo topics in the pubsub package.

also we switch from repo name to repo id for pubsub topic -> this fixes an multi-forge bug :)

part of #6317

[woodpecker-bot]

Surge PR preview deployment was removed

[codecov]

Codecov Report

❌ Patch coverage is 39.53488% with 52 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.36%. Comparing base (7a29f49) to head (66f5648).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
server/rpc/rpc.go	0.00%	16 Missing ⚠️
server/pipeline/topic.go	0.00%	12 Missing ⚠️
server/api/stream.go	0.00%	8 Missing ⚠️
server/pipeline/cancel.go	0.00%	3 Missing ⚠️
server/pipeline/decline.go	0.00%	3 Missing ⚠️
server/pipeline/start.go	0.00%	3 Missing ⚠️
server/pubsub/memory/pub.go	91.89%	2 Missing and 1 partial ⚠️
server/pubsub/pubsub.go	0.00%	2 Missing ⚠️
cmd/server/setup.go	0.00%	1 Missing ⚠️
server/rpc/server.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6318      +/-   ##
==========================================
+ Coverage   33.30%   33.36%   +0.06%     
==========================================
  Files         420      421       +1     
  Lines       28347    28342       -5     
==========================================
+ Hits         9440     9456      +16     
+ Misses      18029    18007      -22     
- Partials      878      879       +1     

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[6543]

go.woodpecker-ci.org/woodpecker/v3/server/pubsub/memory/pub.go:35:	New		100.0%
go.woodpecker-ci.org/woodpecker/v3/server/pubsub/memory/pub.go:41:	Publish		84.6%
go.woodpecker-ci.org/woodpecker/v3/server/pubsub/memory/pub.go:67:	Subscribe	100.0%
go.woodpecker-ci.org/woodpecker/v3/server/pubsub/pubsub.go:52:		GetRepoTopic	0.0%
total:									(statements)	89.7%

this is the coverage of just running new added TestPubSub !

@anbraten it also explizite covers the duplication test and is written in a way to just pass in new adapters asap we have them

[qwerty287]

also untested

[6543]

sorry last commit did belong to other pull and was reverted right away 😅