🐛 [RUMF-1021] fix regression on renew session

[bcaudan]

Motivation

monitoring code introduced by #1091 can prevent session to be renewed by overwriting the in memory session id.

Changes

Overwrite in memory session id only in expandOrRenewSession

Testing

local, staging

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I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #1096 (8c7bc0b) into main (32a5f92) will decrease coverage by 0.02%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #1096      +/-   ##
==========================================
- Coverage   89.14%   89.11%   -0.03%     
==========================================
  Files          90       90              
  Lines        4190     4190              
  Branches      954      954              
==========================================
- Hits         3735     3734       -1     
- Misses        455      456       +1     

Impacted Files	Coverage Δ
packages/core/src/domain/sessionManagement.ts	96.15% <50.00%> (-0.97%)	⬇️

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