Fix reconciler not working after reapply when was still queued

Created by: eseliger

This fixes an error where the reconciler would determine an empty delta between changeset specs, when the user applies again before a changeset record was processed or had errored.

I hope I am not missing something. @mrnugget asking you for special care when reviewing as you probably have the most insight into the rewirer/reconciler since you originally wrote most of them. I hope this doesn't have other side-effects.

Closes https://github.com/sourcegraph/sourcegraph/issues/16041

Created by: sourcegraph-bot

Notifying subscribers in CODENOTIFY files for diff 659d169ab2e23e89e43a09f899f825f04a476a43...a29ea92ff6ff3f2a317df5a7493277279b337728.

Notify	File(s)
@LawnGnome	enterprise/internal/campaigns/rewirer.go enterprise/internal/campaigns/service_apply_campaign_test.go

Created by: codecov[bot]

Codecov Report

Merging #16144 (a29ea92) into main (659d169) will decrease coverage by 0.00%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main   #16144      +/-   ##
==========================================
- Coverage   52.78%   52.78%   -0.01%     
==========================================
  Files        1646     1646              
  Lines       82355    82358       +3     
  Branches     7407     7407              
==========================================
+ Hits        43470    43471       +1     
- Misses      35033    35034       +1     
- Partials     3852     3853       +1     

Flag	Coverage Δ		*Carryforward flag
go	52.53% <100.00%> (-0.01%)
integration	28.45% <ø> (ø)		Carriedforward from 616e86e
storybook	28.03% <ø> (ø)		Carriedforward from 616e86e
typescript	53.39% <ø> (ø)		Carriedforward from 616e86e
unit	35.90% <ø> (ø)		Carriedforward from 616e86e

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
enterprise/internal/campaigns/rewirer.go	82.90% <100.00%> (+0.44%)
.../internal/codeintel/resolvers/graphql/locations.go	83.50% <0.00%> (-2.07%)