fix(DB/Quest): Hemet Nesingwary flying machine speed and orientation

[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).

Issues Addressed:

• Closes [Sholazar Basin] Where in the World is Hemet Nesingwary -- plane is too slow #21494
• Closes [Sholazar Basin] Where in the World is Hemet Nesingwary -- plane is too slow chromiecraft/chromiecraft#7837

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).

Reference video from issue: https://www.youtube.com/watch?v=zSiXX7uS48k

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.

1. .go creature id 28160 (Archmage Pentarus in Wintergarde Keep)
2. Accept quest 12521 "Where in the World is Hemet Nesingwary?"
3. Talk to Archmage Pentarus to take the flight
4. Verify the flying machine travels at a reasonable speed (not too slow)
5. Verify the flying machine faces INTO the portal when arriving at it (not turning away)

Known Issues and TODO List:

• None

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