refactor: cache HasAuthority to avoid recomputing it on every access

[noellie-velez]

Purpose of this PR

• refactor: precalculate HasAuthority into cached m_HasAuthority field
  • Removed InternalHasAuthority() and replaced with private m_HasAuthority field
  • Set m_HasAuthority on Spawn (before SpawnInternal), cleared on despawn, updated on ownership change
  • Replaced all internal HasAuthority call sites with direct m_HasAuthority field access
  • Updated public HasAuthority property to return cached value when spawned

Jira ticket

MTT-14792

Changelog

N/A

Documentation

• No documentation changes or additions were necessary.

Testing & QA (How your changes can be verified during release Playtest)

Functional Testing

Manual testing :

• Manual testing done

Automated tests:

• Covered by existing automated tests
• Covered by new automated tests

Does the change require QA team to:

• Review automated tests?
• Execute manual tests?
• Provide feedback about the PR?

If any boxes above are checked the QA team will be automatically added as a PR reviewer.

Backports

N/A