Stashing Deletes does not appear to work in Basic Mode

In Basic Mode, stashing deletes leads to the following error, at least when those deletes are not owned by the user (see https://github.com/intersystems/git-source-control/issues/729 for when this can occur):

```
ERROR importingHCC.Something.WithA.Really.Long.Foo.CLS

ERROR #5012: File '/data/db/mgr/repo/NPETROCE/src/HCC/Something/WithA/Really/Long/Foo.cls' does not exist [e^Load+1^%SYSTEM.OBJ.1^1 e^ImportItem+37^SourceControl.Git.Utils.1^1 e^OnPull+27^SourceControl.Git.PullEventHandler.IncrementalLoad.1^1 e^OnPull+4^SourceControl.Git.PullEventHandler.Default.1^1 e^ForModifications+15^SourceControl.Git.PullEventHandler.1^1 e^SyncIrisWithRepoThroughDiff+42^SourceControl.Git.Utils.1^1 e^RunGitCommandWithInput+182^SourceControl.Git.Utils.1^1 e^HandleRequest+210^SourceControl.Git.WebUIDriver.1^1 d^zOnPreHTTP+43^%Z.usertemplate.gitsourcecontrol.webuidriver.1^1 e^Page+8^%Z.usertemplate.gitsourcecontrol.webuidriver.1^1 e^CSPDispatch+503^%SYS.cspServer^2 d^CSPDispatch+280^%SYS.cspServer^1 d^ProcessRequest+1^%CSP.Session.1^1 d^Request+683^%SYS.cspServer2^1 d^Request+25^%SYS.cspServer2^1 d^ProcessRequest+1^%CSP.Request.1^1 d^css+21^%SYS.cspServer2^1 d^Server+64^%SYS.SERVER^2 d^^^0:NPETROCE]
Compilation started on 03/12/2025 14:48:03 with qualifiers 'ck'
ERROR #5351: Class 'HCC.Something.WithA.Really.Long.Foo' does not exist. [e^finddependencyclasses+5^%occDepend^1 e^findalldependencyclasses+8^%occDepend^1 e^IncludeClasses+43^%occCompile^1 e^CompileList+59^%occCompile^1 e^realCompile+59^%Studio.Project.1^1 e^CompileList+19^%SYSTEM.OBJ.1^1 e^OnPull+35^SourceControl.Git.PullEventHandler.IncrementalLoad.1^1 e^OnPull+4^SourceControl.Git.PullEventHandler.Default.1^1 e^ForModifications+15^SourceControl.Git.PullEventHandler.1^1 e^SyncIrisWithRepoThroughDiff+42^SourceControl.Git.Utils.1^1 e^RunGitCommandWithInput+182^SourceControl.Git.Utils.1^1 e^HandleRequest+210^SourceControl.Git.WebUIDriver.1^1 d^zOnPreHTTP+43^%Z.usertemplate.gitsourcecontrol.webuidriver.1^1 e^Page+8^%Z.usertemplate.gitsourcecontrol.webuidriver.1^1 e^CSPDispatch+503^%SYS.cspServer^2 d^CSPDispatch+280^%SYS.cspServer^1 d^ProcessRequest+1^%CSP.Session.1^1 d^Request+683^%SYS.cspServer2^1 d^Request+25^%SYS.cspServer2^1 d^ProcessRequest+1^%CSP.Request.1^1 d^css+21^%SYS.cspServer2^1 d^Server+64^%SYS.SERVER^2 d^^^0:NPETROCE]
Skipping class HCC.Something.WithA.Really.Long.Foo
Detected 1 errors during compilation in 0.001s.

Updating production... done.

error: Entry 'src/npetroce/testclass3.cls' not uptodate. Cannot merge.
Cannot save the current worktree state
```

Steps to reproduce: reproduce https://github.com/intersystems/git-source-control/issues/729 then attempt to stash the delete.