fix(DB/Conditions): 'Zeth'Gor Must Burn!' setting the sky on fire

[avarishd]

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 Marking a tower for Zeth'Gor Must Burn! sets the sky on fire #14284
• Closes Marking a tower for Zeth'Gor Must Burn! sets the sky on fire chromiecraft/chromiecraft#4577

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.

.q add 10895
.go c id 22401
use the item at the bottom of the tower (do this for the other 3)
(you need to be within visibility range of the squad (2 spawn points) locations in order for the event to start)

Known Issues and TODO List:

• Sometimes foothill tower will get bombed when gryphons are flying away from forge tower (left path)
• you need to be in visibility range in order for the squad to show (unrelated to this pr)

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http://www.azerothcore.org/wiki/How-to-test-a-PR

REMEMBER: when testing a PR that changes something generic (i.e. a part of code that handles more than one specific thing), the tester should not only check that the PR does its job (e.g. fixing spell XXX) but especially check that the PR does not cause any regression (i.e. introducing new bugs).

For example: if a PR fixes spell X by changing a part of code that handles spells X, Y, and Z, we should not only test X, but we should test Y and Z as well.