🐛[RUMF-308] do not track session without id

[bcaudan]

a tracked session must have a session id

[codecov-io]

Codecov Report

Merging #260 into master will increase coverage by 0.68%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #260      +/-   ##
========================================
+ Coverage   85.32%    86%   +0.68%     
========================================
  Files          24     24              
  Lines        1315   1315              
  Branches      277    277              
========================================
+ Hits         1122   1131       +9     
+ Misses        193    184       -9

Impacted Files	Coverage Δ
packages/rum/src/rum.entry.ts	71.42% <0%> (+2.04%)	⬆️
packages/logs/src/loggerSession.ts	100% <0%> (+5.88%)	⬆️
packages/core/src/requestCollection.ts	96.15% <0%> (+13.46%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 627cd42...a2c81ae. Read the comment docs.