Support null for options parameter from OptionTransform type

[ddubrava]

Fixes #21023

[alan-agius4]

Hi @ddubrava,

Are you still interested in landing this?

[ddubrava]

Hi! I’m interested in merging :) so if you want to close the issue (#21023), I will complete this PR (resolve conflicts, concerns)

[alan-agius4]

In that case can you please rebase, fix the conflicts and afterwards resolve the failing CI steps by running the below.

yarn bazel run //packages/angular_devkit/schematics:schematics_api.accept
yarn ng-dev format changed

Thanks

[alan-agius4]

LGTM, can you please squash the commits into the first two?

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