[IOPID-2359] remove remote FF session refresh

[Ladirico]

Warning

This PR depends on pagopa/io-services-metadata#847

Short description

Delete remote session refresh FF

How to test

Run the application using local environment and iand using proxyman or any tool that can intercept the fetch calls made by the app you'll see that in this one here: http://proxyman.local:3000/static_contents/status/backend.json?ms=* the value sessionRefresh is not entered (as you can see from the screen)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.28%. Comparing base (65c0c14) to head (695fb12).
Report is 7 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #425   +/-   ##
=======================================
  Coverage   64.28%   64.28%           
=======================================
  Files         167      167           
  Lines        5362     5362           
  Branches      754      754           
=======================================
  Hits         3447     3447           
  Misses       1775     1775           
  Partials      140      140           

Files with missing lines	Coverage Δ
src/payloads/backend.ts	100.00% <ø> (ø)

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[dpulls]

🎉 All dependencies have been resolved !

[Hantex9]

LGTM!