Drop cherry-pick call-to-action from hotfix branch list in merge messages (#266)

The queued/successful_merge templates were telling developers to open a
separate cherry-pick PR to every phantom hotfix branch in the cascade.
This is wrong: the repo can have dozens of old post-GA hotfix branches,
none of which need a cherry-pick from this PR.

The cherry-pick reminder is only appropriate when the Jira ticket
explicitly carries a hotfix fix version (handled separately by
PendingHotfixVersionReminder). The merge messages should simply note
that the hotfix branches were not targeted and were left untouched,
with no call to action.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: charlesprost

bert_e/templates/queued.md

@@ -24,8 +24,8 @@ The following branches will **NOT** be impacted:
 {% endif %}
 
 {% if pending_hotfixes %}
-:warning: This pull request does **not** target the following hotfix
-branch(es). Please open a separate cherry-pick pull request to each:
+This pull request does not target the following hotfix branch(es) so they
+will be left untouched:
 
 {% for branch in pending_hotfixes -%}
 * `{{ branch.name }}`

bert_e/templates/successful_merge.md

@@ -17,8 +17,8 @@ The following branches have **NOT** changed:
 {% endif %}
 
 {% if pending_hotfixes %}
-:warning: This pull request did **not** target the following hotfix
-branch(es). Please open a separate cherry-pick pull request to each:
+This pull request did not target the following hotfix branch(es) so they
+were left untouched:
 
 {% for branch in pending_hotfixes -%}
 * `{{ branch.name }}`