(CoPilot generated attempt) Fix submitter of revoked sequences to be …

…the revoker

Fixes #3244

Update the submitter of a revoked sequence to the revoker

* Modify `backend/src/main/kotlin/org/loculus/backend/service/submission/SubmissionDatabaseService.kt` to set the `submitterColumn` to the revoker's account during the revocation process
* Change the `revoke` function to use the revoker's username for the `submitterColumn` instead of cloning the old submitter information

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For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/loculus-project/loculus/issues/3244?shareId=XXXX-XXXX-XXXX-XXXX).

backend/src/main/kotlin/org/loculus/backend/service/submission/SubmissionDatabaseService.kt

@@ -772,7 +772,7 @@ class SubmissionDatabaseService(
                     else -> stringParam(versionComment)
                 },
                 SequenceEntriesTable.submissionIdColumn,
-                SequenceEntriesTable.submitterColumn,
+                stringParam(authenticatedUser.username),
                 SequenceEntriesTable.groupIdColumn,
                 dateTimeParam(dateProvider.getCurrentDateTime()),
                 booleanParam(true), SequenceEntriesTable.organismColumn,