Fix installer crash on particular environments with existing IPM code

[isc-dchui]

Description

• Fixes Installing IPM with older version of IPM on the system may result in crash #1209

Testing

Manually tested by running these steps:

1. Install IPM
2. Package snapshot
   a. zpm "package zpm -only -p /tmp/zpm-0.10.9"
   b. w ##class(IPM.Installer).MakeFile("/tmp/zpm-0.10.9.tgz","/tmp/zpm-0.10.9.xml")
3. Break the existing IPM installation
   a. set m = ##class(%IPM.Storage.Module).NameOpen("zpm")
   b. do ##class(%IPM.Storage.Module).%DeleteId(m.%Id())
   c. do $system.OBJ.Delete("%IPM.Utils.Module","d")
4. Reinstall IPM with do $system.OBJ.Load("/tmp/zpm-0.10.9.xml","ck")

(To reproduce the crash, replace step 4 with installing 0.10.8)

Checklist

• This branch has the latest changes from the main branch rebased or merged.
• Changelog entry added.
• Unit (zpm test -only) and integration tests (zpm verify -only) pass.
• Style matches the style guide in the contributing guide.
• Documentation has been/will be updated
  • Source controlled docs, e.g. README.md, should be included in this PR and Wiki changes should be made after this PR is merged (add an extra issue for this if needed)
• Pull request correctly renders in the "Preview" tab.