[IOCOM-2086] addition of SEND banner to payload

[forrest57]

Short description

addition of said banner's ID to the payloads object

List of changes proposed in this pull request

• addition of banner ID

How to test

when checking out this PR: pagopa/io-app#6756

after enabling the banner in app, it should correctly render in the second place.

[Vangaorth]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.97%. Comparing base (0f932a0) to head (7fa808b).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #469   +/-   ##
=======================================
  Coverage   63.97%   63.97%           
=======================================
  Files         164      164           
  Lines        5346     5349    +3     
  Branches      703      708    +5     
=======================================
+ Hits         3420     3422    +2     
- Misses       1925     1926    +1     
  Partials        1        1           

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

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