flutter_flutter

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Allow the Slider to always show the value indicator. (#162223 )

Fixes: #34704

Modified enum `ShowValueIndicator`
before:
```dart
enum ShowValueIndicator {
  onlyForDiscrete,
  onlyForContinuous,
  always,
  never,
}
```
after:
```dart
enum ShowValueIndicator {
  onlyForDiscrete,
  onlyForContinuous,
  @Deprecated(
    'Use ShowValueIndicator.onDrag. '
    'This feature was deprecated after v3.28.0-1.0.pre.',
  )
  always,
  onDrag,
  alwaysVisible,
  never,
}
```
To maintain previous behavior, `ShowValueIndicator.onlyForDiscrete` and
`ShowValueIndicator.onlyForContinuous` are still retained.

The behavior of `ShowValueIndicator.always` remains consistent with the
previous implementation, but it is marked as deprecated and should be
replaced with `ShowValueIndicator.onDrag`. A new
`ShowValueIndicator.alwaysVisible` has been added to show the value
indicator even when not dragging.

Additionally, the value indicator is now rendered by `OverlayPortal`.


*If you had to change anything in the [flutter/tests] repo, include a
link to the migration guide as per the [breaking change policy].*

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