♻️ migrate all packages to individual createHook instances

[BenoitZugmeyer]

Motivation

The hooks system previously used a centralized object with a HookNames enum to register and trigger callbacks. This made each consumer depend on the full hooks object even when it only needed one specific hook, and provided no per-hook type safety. Moving to individual, typed Hook instances makes each component receive exactly the hook it needs, with proper TypeScript types for its parameters and return value.

This is a first step toward moving hooks and their dependencies to js-core, which will be done in a follow-up PR.

Changes

• Add a createHook<Params, Result>() primitive to browser-core with a typed Hook<Params, Result> interface (register / trigger), preserving DISCARDED and SKIPPED semantics
• Replace the centralized abstractHooks-based Hooks type in browser-rum-core with a plain object of named Hook instances (assemble, assembleTelemetry)
• Migrate all context modules (accountContext, globalContext, tabContext, urlContexts, viewCollection, trackingConsentContext) to accept individual hook instances instead of the full hooks object

Test instructions

This is a pure internal refactoring — no user-visible behaviour changes. Load any standard RUM or Logs sandbox setup and verify that events continue to be collected normally.

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	171.86 KiB	172.06 KiB	+208 B	+0.12%	✅
Rum Profiler	7.88 KiB	7.88 KiB	0 B	0.00%	✅
Rum Recorder	21.21 KiB	21.21 KiB	0 B	0.00%	✅
Logs	54.31 KiB	54.40 KiB	+92 B	+0.17%	✅
Rum Slim	129.69 KiB	129.90 KiB	+212 B	+0.16%	✅
Worker	22.96 KiB	22.96 KiB	0 B	0.00%	✅

[datadog-datadog-prod-us1]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 93.75%
• Overall Coverage: 76.79% (+0.01%)

_{This comment will be updated automatically if new data arrives.
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