fix(Core/Scripts): TrialOfTheChampion: Fix Grand Champions agro before event end

[p-tkachuk]

Changes Proposed:

This PR proposes changes to:

• Core (units, players, creatures, game systems).
• Scripts (bosses, spell scripts, creature scripts).
• Database (SAI, creatures, etc).

Issues Addressed:

If player will be near position where Grand Champions are spawned - they will became aggressive towards player, not taking in to account that their AI is set to be passive (happens because MoveInLineOfSight triggers during spawn, but REACT_PASSIVE is set after it)

SOURCE:

The changes have been validated through:

• Live research (checked on live servers, e.g Classic WotLK, Retail, etc.)
• Sniffs (remember to share them with the open source community!)
• Video evidence, knowledge databases or other public sources (e.g forums, Wowhead, etc.)
• The changes promoted by this pull request come partially or entirely from another project (cherry-pick). Cherry-picks must be committed using the proper --author tag in order to be accepted, thus crediting the original authors, unless otherwise unable to be found

Tests Performed:

This PR has been:

• Tested in-game by the author.
• Tested in-game by other community members/someone else other than the author/has been live on production servers.
• This pull request requires further testing and may have edge cases to be tested.

How to Test the Changes:

1. create 2 character, level up to 80 (.level 79)
2. .tele tournament
3. create party of those 2 players
4. enter to Trial of Champions dungeon
5. Mount vehicles
6. Leave one player at the entrance, where Grand Champions suppose to be spawned
7. start the tournament. Observe that Grand Champions no longer persuade players while event in action

Known Issues and TODO List:

• [ ]
• [ ]

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