Add closing X in date_picker, time_picker, and tolerance_picker

[axrolld]

If https://github.com/osrd-project/osrd-confidential/issues/849 is being done at the same time:

Otherwise:

AC

• when bumping the new release in osrd, don't forget to update the stdcm test to close the tolerance modal in stdcm-page-model.ts l.382