Check for hour, minute & second validity
bug #9441 [Form][DateTimeToArrayTransformer] Check for hour, minute & second validity (egeloen)

This PR was submitted for the 2.3-dev branch but it was merged into the 2.3 branch instead (closes #9441).

Discussion
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[Form][DateTimeToArrayTransformer] Check for hour, minute & second validity

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9440
| License       | MIT
| Doc PR        | -

This PR checks if hour, minute & second values are valid in the datetime to array transformer (values must be integer if they exist).

Commits
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1543653 [Form][DateTimeToArrayTransformer] Check for hour, minute & second validity