Fix: Require explicit GVL vendor ID declaration for aliases

[bsardo]

This PR does the following:
Removes logic that allows aliases to inherit the GVL ID from its parent
Explicitly declares the same GVL ID for the aliases as its parent when it is clear the alias and parent are the same entity:

• admaticde
• epsilon (conversant rebranding)
• equativ (owns smartadserver)
• freewheel-ssp
• magnite
• showheroes-bs
• showheroesBs
• ttd
• yahooAdvertisting
• yahoossp

The following aliases are currently inheriting a GVL ID from the parent but IMO it is not clear that the alias should use the same GVL ID as the parent. Some of these though do appear to have their own GVL entries in the latest Global Vendor List:

• adform (alias of adf)
• copper6 (alias of adtelligent) —> should probably be 1356 according to latest GVL
• finative (alias of seedingalliance)
• indicue (alias of adtelligent)
• janet (alias of adtelligent)
• monetixads (alias of admatic)
• netaddiction (alias of admatic)
• pgam (alias of adtelligent) —> should probably be 1353 according to latest GVL
• pixad (alias of admatic)
• rxnetwork (alias of adkernel)
• streamkey (alias of adtelligent)
• tagoras (alias of vidazoo) —> should probably be 1450 according to latest GVL
• xapads (alias of adkernel) —> should probably be 1320 according to latest GVL
• yobee (alias of admatic)
  We need to decide how to handle these.

[SyntaxNode]

Please add a comment in this method explaining the GVLVendorID is specifically excluded, and why, so it isn't seen as a mistake and changed in the future.