ng update @angular/cli always output list of updated file

[elvisbegovic]

🐞 Bug report

Command (mark with an x)

• update

Is this a regression?

I don't know

Description

Run many times same ng update command migrate only on package @angular/cli from v8, CLI always output all files that are updated

🔬 Minimal Reproduction

One line repro:
ng new clibug --minimal --defaults && cd clibug && npm install && ng update @angular/cli --migrateOnly --from=8 --allowDirty && ng update @angular/cli --migrateOnly --from=8 --allowDirty && ng update @angular/cli --migrateOnly --from=8 --allowDirty

🌍 Your Environment

See Environment version

Angular CLI: 9.0.0-rc.2
Node: 13.1.0
OS: win32 x64
Angular: 9.0.0-rc.2
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Package                           Version
@angular-devkit/architect         0.900.0-rc.2

@angular-devkit/build-angular     0.900.0-rc.2

@angular-devkit/build-optimizer   0.900.0-rc.2

@angular-devkit/build-webpack     0.900.0-rc.2

@angular-devkit/core              9.0.0-rc.2

@angular-devkit/schematics        9.0.0-rc.2

@ngtools/webpack                  9.0.0-rc.2

@schematics/angular               9.0.0-rc.2

@schematics/update                0.900.0-rc.2

rxjs                              6.5.3

typescript                        3.6.4

webpack                           4.41.2

Anything else relevant?
cc @alan-agius4

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