feat: VPP app editing functionality

[jahzielv]

For #24557

Checklist for submitter

If some of the following don't apply, delete the relevant line.

• Input data is properly validated, SELECT * is avoided, SQL injection is prevented (using placeholders for values in statements)
• Added/updated automated tests
• Manual QA for all new/changed functionality

[codecov]

Codecov Report

Attention: Patch coverage is 71.87500% with 27 lines in your changes missing coverage. Please review.

Please upload report for BASE (feat-vpp-apps-labels@284dff7). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
ee/server/service/vpp.go	69.56%	14 Missing and 7 partials ⚠️
server/service/vpp.go	60.00%	6 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##             feat-vpp-apps-labels   #25860   +/-   ##
=======================================================
  Coverage                        ?   63.60%           
=======================================================
  Files                           ?     1625           
  Lines                           ?   155682           
  Branches                        ?     4025           
=======================================================
  Hits                            ?    99019           
  Misses                          ?    48846           
  Partials                        ?     7817           

Flag	Coverage Δ
backend	64.45% <71.87%> (?)

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[iansltx]

LGTM! Thanks for the quick feedback loops here.

[jahzielv]

Merged as docs checks can happen on merge to main