fix(session): eliminate memory leak in session managers

[DudaGod]

I backported webdriverio#14972 to make session managers register and remove event listeners with the same function references. This prevents listeners from accumulating across session reloads and deletion.

I preserved the fork-specific ContextManager behavior while resolving the upstream conflicts: the disabled classic/BiDi result listener remains disabled, and its test reflects the listeners that are actually registered by this fork.

This change intentionally does not handle failures inside the asynchronous navigationStarted listener. I verified separately that the getTree unhandled-rejection scenario still reproduces on top of this backport; that behavior will be addressed in a follow-up.

Upstream: webdriverio#14972

Checks:

• pnpm compile:all:core
• pnpm compile:all:main
• pnpm exec vitest --config vitest.config.ts --run packages/webdriverio/tests/session (3 files, 10 tests)
• pnpm exec tsc -p packages/webdriverio/tsconfig.json --noEmit
• pnpm exec eslint on all changed source and test files

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commit: 2e4dd47