✨ [RUMF-1533] flush pending data on session expiration

[BenoitZugmeyer]

Motivation

With stopSession #2064 now available, it could be useful to use it to flush pending data in some specific integrations (ex: CI integration tests).

Changes

Flush pending data on session expiration.

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #2150 (af81d18) into main (046e3a5) will decrease coverage by 0.13%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##             main    #2150      +/-   ##
==========================================
- Coverage   93.72%   93.59%   -0.13%     
==========================================
  Files         198      198              
  Lines        6089     6092       +3     
  Branches     1357     1357              
==========================================
- Hits         5707     5702       -5     
- Misses        382      390       +8     

Impacted Files	Coverage Δ
...ckages/core/src/transport/startBatchWithReplica.ts	81.81% <ø> (ø)
packages/logs/src/domain/logsSessionManager.ts	100.00% <ø> (ø)
packages/rum-core/src/domain/rumSessionManager.ts	90.69% <ø> (ø)
packages/rum-core/test/mockRumSessionManager.ts	91.66% <0.00%> (-2.62%)	⬇️
packages/core/src/transport/flushController.ts	100.00% <100.00%> (ø)
packages/logs/src/boot/startLogs.ts	86.11% <100.00%> (ø)
packages/logs/src/transport/startLogsBatch.ts	100.00% <100.00%> (ø)
packages/rum-core/src/boot/startRum.ts	85.71% <100.00%> (ø)
packages/rum-core/src/transport/startRumBatch.ts	82.14% <100.00%> (ø)

... and 2 files with indirect coverage changes

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