WIP: Fix source link integration

[rasmus]

Fixes #644

[rasmus]

PDB file no longer embedded, but present in snupkg file.

[codecov]

Codecov Report

Merging #645 into develop will decrease coverage by 0.16%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #645      +/-   ##
===========================================
- Coverage    72.32%   72.16%   -0.17%     
===========================================
  Files          317      317              
  Lines         7910     7910              
  Branches      2319     2319              
===========================================
- Hits          5721     5708      -13     
  Misses        1433     1433              
- Partials       756      769      +13

Impacted Files	Coverage Δ
...l/SnapshotStores/PostgresSqlSnapshotPersistence.cs	67.21% <0%> (-13.12%)	⬇️
...EventFlow/Configuration/Bootstraps/Bootstrapper.cs	92.59% <0%> (-3.71%)	⬇️
...w.MsSql/RetryStrategies/MsSqlErrorRetryStrategy.cs	48.27% <0%> (-3.45%)	⬇️
...Core/VersionedTypes/VersionedTypeUpgradeService.cs	78.37% <0%> (-2.71%)	⬇️
...EventFlow/ReadStores/InMemory/InMemoryReadStore.cs	69.56% <0%> (-2.18%)	⬇️
...ce/EventFlow/Sagas/AggregateSagas/AggregateSaga.cs	91.3% <0%> (-2.18%)	⬇️
Source/EventFlow/Sagas/DispatchToSagas.cs	87.67% <0%> (-1.37%)	⬇️
...entFlow/EventStores/Files/FilesEventPersistence.cs	69.11% <0%> (+0.73%)	⬆️

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