refactor!: remove date-time related deprecations, EMPTY_VALIDATOR

[vladimirpotekhin]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows Conventional Commits
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Refactoring
• Code style update
• Build or CI related changes
• Documentation content changes

What is the current behavior?

Closes #

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

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[codecov]

Codecov Report

Merging #2164 (4401445) into v3.x (d15c8d2) will decrease coverage by 0.15%.
The diff coverage is 62.96%.

@@            Coverage Diff             @@
##             v3.x    #2164      +/-   ##
==========================================
- Coverage   60.72%   60.57%   -0.16%     
==========================================
  Files         917      917              
  Lines        9398     9351      -47     
  Branches     1888     1885       -3     
==========================================
- Hits         5707     5664      -43     
+ Misses       3257     3254       -3     
+ Partials      434      433       -1     

Flag	Coverage Δ
addon-charts	74.40% <ø> (-0.05%)	⬇️
addon-doc	21.23% <ø> (ø)
addon-editor	46.19% <0.00%> (ø)
addon-mobile	∅ <ø> (∅)
addon-table	83.78% <ø> (ø)
addon-tablebars	∅ <ø> (∅)
cdk	65.87% <85.71%> (-0.73%)	⬇️
core	67.20% <55.55%> (ø)
kit	59.33% <0.00%> (ø)
summary	60.57% <62.96%> (-0.16%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
projects/addon-commerce/enums/currency-code.ts	100.00% <ø> (ø)
...or/directives/design-mode/design-mode.directive.ts	22.30% <0.00%> (ø)
projects/cdk/constants/empty.ts	100.00% <ø> (ø)
projects/cdk/date-time/date-fillers.ts	100.00% <ø> (ø)
projects/cdk/date-time/month-range.ts	100.00% <ø> (ø)
projects/cdk/date-time/time.ts	97.95% <ø> (ø)
.../cdk/directives/focus-trap/focus-trap.directive.ts	5.88% <0.00%> (ø)
projects/cdk/exceptions/invalid-day.exception.ts	100.00% <ø> (ø)
projects/cdk/exceptions/invalid-month.exception.ts	100.00% <ø> (ø)
projects/cdk/exceptions/invalid-year.exception.ts	100.00% <ø> (ø)
... and 19 more

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[well-done-bot]