fix(Scripts/CoS): Entrance NPCs gossip about the situation

[blinkysc]

[!] Please Read! This PR comes from AI with MCP

Changes Proposed:

This PR proposes changes to:

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

Adds C++ CreatureScript npc_cos_entrance_gossip for Hearthsinger Forresten (30551) and Fras Siabi (30552) to trigger their existing creature_text conversations with Footman James and Gryan Stoutmantle at the Culling of Stratholme entrance.

Issues Addressed:

• Closes (Instance/Culling of Stratholme): First pack of Stratholme Citizens/Residents do not gossip about "the situation". #15626

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:

• This pull request can be tested by following the reproduction steps provided in the linked issue
• This pull request requires further testing. Provide steps to test your changes. If it requires any specific setup e.g multiple players please specify it as well.

1. .go xyz 1565 600 100 595 to teleport to CoS entrance area
2. Wait for Hearthsinger Forresten and Fras Siabi to start their conversations
3. Verify Hearthsinger talks with Footman James about the illness (4-line exchange)
4. Verify Fras Siabi talks with Gryan Stoutmantle (3-line exchange with nod)

Known Issues and TODO List:

• None

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[Nyeriah]

Please move this code outside the constructor

[Nyeriah]

Normally for simple talk like this events are not needed, the talk function has a built in delay param