fix(DB/Creature) - Darkfang Venomspitter under the map

[TheSCREWEDSoftware]

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 [NPC] Darkfang Venomspitter underneath terrain chromiecraft/chromiecraft#7506
• Closes [Dustwallow Marsh] Darkfang Venomspitter underneath terrain. #20594

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.

• .go xyz -3215.17 -3649.05 52.9613 1 4.08407 for 18622
  and

• .go xyz -2572.63 -3742.22 31.0639 1 2.47837 for 7887

Known Issues and TODO List:

• Sniff? For the both NPCs have no path/patrol

[Rorschach91]

I don't think that a sniff is needed.
PR tested. It works.

[TheSCREWEDSoftware]

I don't think that a sniff is needed. PR tested. It works.

Even if they don't move? they dont have path/patrol associated to them. They do follow you and attack, but they dont wonder

[heyitsbench]

A sniff would eventually be nice to respawn these guys from scratch, but for now it gets them out of the ground, so it's good enough.