Expand PWS Usage by Disc Priests (#2403)

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## Pull Request Description
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Disc Priests currently do not use Power Word: Shield until a party
member is at "medium health" (configurable, default 65%). That is the
second-level healing threshold; at the highest level, "almost full
health" (configurable, default 85%), Disc Priests will use only Prayer
of Mending and Renew. This PR adds PWS as the highest priority healing
action starting at "almost full health."


## Feature Evaluation
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- Describe the **minimum logic** required to achieve the intended
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- Describe the **processing cost** when this logic executes across many
bots.
Added new action "power word: shield on party" to "party member almost
full health" trigger in HealPriestStrategy.cpp (the "heal" strategy,
which is the default strategy for Disc Priests, as Holy Priests use the
"holy heal" strategy).


## How to Test the Changes
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Group up with a Disc Priest and take damage; confirm that PWS is cast
when you drop below your configured almost full health threshold.


## Impact Assessment
<!-- As a generic test, before and after measure of pmon (playerbot pmon
tick) can help you here. -->
- Does this change increase per-bot/per-tick processing or risk scaling
poorly with thousands of bots?
    - - [x] No, not at all
    - - [ ] Minimal impact (**explain below**)
    - - [ ] Moderate impact (**explain below**)



- Does this change modify default bot behavior?
    - - [ ] No
    - - [x] Yes (**explain why**)

PWS is the signature ability of Disc. Priests, and delaying it to 65% is
significantly limiting their effectiveness in group content,
particularly with raid bosses that deal raidwide damage and in heroic
dungeons, where waiting until the tank hits 65% is a death wish. This
single change makes an enormous difference in their effectiveness.

See below for before/after change for Eredar Twins (focus on the
activity).

Before:

<img width="693" height="397" alt="Screenshot 2026-05-18 201949"
src="https://github.com/user-attachments/assets/18ad84c7-9ad8-4c39-94e7-650c9bb5f36e"
/>

After:

<img width="746" height="409" alt="image"
src="https://github.com/user-attachments/assets/6240f118-e12f-44c7-a1af-373e94985957"
/>


- Does this change add new decision branches or increase maintenance
complexity?
    - - [x] No
    - - [ ] Yes (**explain below**)



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- - [ ] Yes (**explain below**)
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## Final Checklist

- - [x] Stability is not compromised.
- - [x] Performance impact is understood, tested, and acceptable.
- - [x] Added logic complexity is justified and explained.
- - [x] Any new bot dialogue lines are translated.
- - [x] Documentation updated if needed (Conf comments, WiKi commands).

## Notes for Reviewers
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src/Ai/Class/Priest/Strategy/HealPriestStrategy.cpp

@@ -86,6 +86,7 @@ void HealPriestStrategy::InitTriggers(std::vector<TriggerNode*>& triggers)
         new TriggerNode(
             "party member almost full health",
             {
+                NextAction("power word: shield on party", ACTION_LIGHT_HEAL + 3),
                 NextAction("prayer of mending on party", ACTION_LIGHT_HEAL + 2),
                 NextAction("renew on party", ACTION_LIGHT_HEAL + 1)
             }