Incremental load PullEventHandler needs to handle deletes

[isc-adepedro]

Steps to reproduce:

• Delete a class
• w ##class(SourceControl.Git.API).Pull()

The deletion is detected by Git/extension ("D" Prefix):

Pulling from branch: test
Fetch done
Files that will be modified by git pull: 
    M.gitlab-ci.yml
    DHS.Local.Hospital.GetPatientInfoProcess.CLSsrc/HS/Local/Hospital/GetPatientInfoProcess.cls
Updating 409377f..48f9b3e
                         Fast-forward
                                      .gitlab-ci.yml                                  | 140 ++++++++++++------------
                                                                                                                     src/HS/Local/Hospital/GetPatientInfoProcess.cls |  48 --------
                                                           2 files changed, 70 insertions(+), 118 deletions(-)
                                                                                                               delete mode 100644 src/HS/Local/Hospital/GetPatientInfoProcess.cls


.gitlab-ci.yml was not imported into the database and will not be compiled.

But an error is thrown right after that:
ERROR #5012: File '/home/irisowner/confstream/hospital/src/HS/Local/Hospital/GetPatientInfoProcess.cls' does not exist