[pickers] Use PaperProps in mobile pickers

[LukasTy]

Part of #6218

To apply styling overrides to both desktop and mobile picker versions popups we currently would need to provide duplicate props:

// overrides style in desktop version
PaperProps={{
  sx: {
    '.MuiPickersCalendarHeader-label': {
      fontSize: 'initial',
    },
  },
}}
// overrides style in mobile version
DialogProps={{
  sx: {
    '.MuiPickersCalendarHeader-label': {
      fontSize: 'initial',
    },
  },
}}

After these changes passing only the following prop would apply changes to both desktop and mobile pickers popup/dialog:

PaperProps={{
  sx: {
    '.MuiPickersCalendarHeader-label': {
      fontSize: 'initial',
    },
  },
}}

[mui-bot]

These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	481.9	796	611.9	632	117.891
Sort 100k rows	ms	530.6	1,002	639.1	763.26	167.006
Select 100k rows	ms	178.2	228.1	218.3	207.02	20.018
Deselect 100k rows	ms	129.6	197.9	184.5	175.18	24.293

Generated by 🚫 dangerJS against ef5fe91

[github-actions]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[flaviendelangle]

This PR is going to be replaced by #6381 to avoid breaking its api just a few days after the introduction of this api.

I checked that with Lukas

[alexfauquette]

Don't know if we should merge it or let's wait for #6381

[flaviendelangle]

Too fast 😆

[flaviendelangle]

Closing this one 👍