♻️ [RUMF-1015] use the url corresponding to the start of the event

[bcaudan]

Motivation

With the introduction of manual view tracking (#924), the creation of a view can be decoupled from URL changes.
In the case of a URL change occurring just before the end of a view, the view URL could wrongly be updated with the new location.

Previous behavior:

• view events: URL updated during the lifecycle of the view
• other events: URL corresponding to the end of the event

New behavior:

• use the URL corresponding to the start of the event

Changes

• Introduce UrlContexts to store URL states history
• Use UrlContexts from assembly to retrieve URL and referrer
• Simplify ContextHistory since we no more need to dynamically generate the current context

Testing

Unit, manually

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I have gone over the contributing documentation.

[codecov-commenter]

Codecov Report

Merging #1063 (0ca461a) into main (a4c60e6) will increase coverage by 0.20%.
The diff coverage is 96.55%.

@@            Coverage Diff             @@
##             main    #1063      +/-   ##
==========================================
+ Coverage   89.06%   89.27%   +0.20%     
==========================================
  Files          88       89       +1     
  Lines        4135     4148      +13     
  Branches      946      948       +2     
==========================================
+ Hits         3683     3703      +20     
+ Misses        452      445       -7     

Impacted Files	Coverage Δ
packages/core/src/tools/utils.ts	87.08% <ø> (ø)
packages/rum-core/src/rawRumEvent.types.ts	100.00% <ø> (ø)
packages/rum-core/src/boot/startRum.ts	37.93% <50.00%> (+2.21%)	⬆️
packages/rum-core/src/domain/assembly.ts	96.42% <100.00%> (+0.06%)	⬆️
packages/rum-core/src/domain/contextHistory.ts	100.00% <100.00%> (ø)
packages/rum-core/src/domain/internalContext.ts	90.00% <100.00%> (+1.11%)	⬆️
packages/rum-core/src/domain/parentContexts.ts	100.00% <100.00%> (ø)
.../src/domain/rumEventsCollection/view/trackViews.ts	97.87% <100.00%> (+1.61%)	⬆️
packages/rum-core/src/domain/urlContexts.ts	100.00% <100.00%> (ø)
... and 1 more

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