Update defaults for guards and resolvers to be functional guards

[atscott]

first two commits are part of https://github.com/angular/angular-cli/pull/24170.

The two commits specific to this are the default updates, which may be considered a breaking change.

[alan-agius4]

Hi @atscott,

We did discuss this PR during our last triage meeting and while we do not guarantee that the generated code does not change between versions. This is too big of a change to be done outside of a major.

We suggest a call out in the deprecation note so users can opt-in and use the non deprecated code template by default

ng config schematics.@schematics/angular:guard.functional true
ng config schematics.@schematics/angular:resolver.functional true

Feel free to close the PR or rebase it and make the necessary changes to eventually land in v16. I also have a separate PR to add an aliased for the implements flag https://github.com/angular/angular-cli/pull/24216

[alan-agius4]

Closing in favor of https://github.com/angular/angular-cli/pull/24585

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