✨ [RUMF-1534] send a view update when session is expiring

[BenoitZugmeyer]

Motivation

Tell the backend to end the session early when we detect that the session expired, especially useful when using stopSession() manually.

Changes

With this PR, the SDK will send a view update with @session.is_active:false every time it detects that the session expires.

Testing

• Local
• Staging
• Unit
• End to end

---

I have gone over the contributing documentation.

[BenoitZugmeyer]

Current dependencies on/for this PR:

• main
  • PR ✨ [RUMF-1534] allow (some) view updates after session expiration #2167
    • PR ✨ [RUMF-1534] send a view update when session is expiring #2166 👈

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[codecov-commenter]

Codecov Report

Merging #2166 (48a28d0) into main (7bd7a6e) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2166      +/-   ##
==========================================
+ Coverage   93.75%   93.87%   +0.11%     
==========================================
  Files         200      200              
  Lines        6102     6105       +3     
  Branches     1363     1366       +3     
==========================================
+ Hits         5721     5731      +10     
+ Misses        381      374       -7     

Impacted Files	Coverage Δ
packages/rum-core/test/fixtures.ts	100.00% <ø> (ø)
.../src/domain/rumEventsCollection/view/trackViews.ts	100.00% <100.00%> (ø)
.../domain/rumEventsCollection/view/viewCollection.ts	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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