[Ability] Fully implement Pastel Veil, update Sweet Veil (after beta fix)

[torranx]

duplicate of #2626 since beta is broken

What are the changes?

• fully implement Pastel Veil
• update Sweet Veil to apply to ally (still partial because the ally should ignore it if it has abilities like mold breaker)
• fixes error from triggering battler tag immunity

Why am I doing these changes?

• not fully implemented ability (pastel veil)
• missing immunity to ally (sweet veil)
• error occurs when battler tag immunity is triggered

What did change?

• changed the existing StatusEffectImmunityAbAttr and BattlerTagImmunityAbAttr to be base classes for both single/field AbAttrs

Screenshots/Videos

How to test the changes?

Pastel Veil

• Overriding ability won't work here since the override will apply to both pokemon on double battle. Instead, you can move Galar Ponyta's second ability (Pastel Veil) to first index in src/data/pokemon-species.ts.
• DOUBLE_BATTLE_OVERRIDE = true
• STARTER_SPECIES_OVERRIDE = Species.GALAR_PONYTA
• OPP_MOVESET_OVERRIDE to have poison moves like TOXIC, POISON_GAS, etc
• read linked ability for test expectation

Sweet Veil

• STARTER_SPECIES_OVERRIDE = Species.SWIRLIX
• DOUBLE_BATTLE_OVERRIDE = true
• OPP_MOVESET_OVERRIDE to have sleep moves like POWDER
• MOVESET_OVERRIDE = [Moves.REST]
• read linked ability for test expectation

OR

$ npm run test pastel_veil
$ npm run test sweet_veil

Checklist

• There is no overlap with another PR?
• The PR is self-contained and cannot be split into smaller PRs?
• Have I provided a clear explanation of the changes?
• Have I tested the changes (manually)?
  • Are all unit tests still passing? (npm run test)
• Are the changes visual?
  • Have I provided screenshots/videos of the changes?