[Feature Request]: Make sure `validate_input` works with all shiny inputs

[gogonzo]

Feature description

See test-shinytest2-validate_input.R in teal and make sure that following tests are covered. Objective of the tests is making sure that js function validateInput is able to find the container with the input value.

    var selector1 = '.shiny-input-container#' + inputId;
    var selector2 = '.shiny-input-container:has(#' + inputId + ')';

If any input is wrapped in other container, then validation message will not find relevant place for it to show the message. (i don't expect such scenario but we need to make sure)

testthat::test_that("e2e: validate_input validates sliderInput")
testthat::test_that("e2e: validate_input validates selectInput")
testthat::test_that("e2e: validate_input validates selectizeInput")
testthat::test_that("e2e: validate_input validates radioButtons")
testthat::test_that("e2e: validate_input validates checkboxGroupInput")
testthat::test_that("e2e: validate_input validates checkboxInput")
testthat::test_that("e2e: validate_input validates dateInput")
testthat::test_that("e2e: validate_input validates dateRangeInput")
testthat::test_that("e2e: validate_input validates pickerInput")

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