Add and apply Naming/PredicateMethod RuboCop 1.76 rule

This rule was introduced in RuboCop 1.76.0 to ensure methods ending
in '?' return boolean.

This commit applies suggested renames and code cleanup:
- Renames 'is_active?' to 'active_class' since it returns a string
- Renames 'parsed_value' to 'in_favor?' and 'is_request_active' to end with '?'
  for boolean semantics
- Skips false positives like 'save', 'auto_labels' or 'save_requiring_finish_signup',
  which are not predicate methods.

app/components/shared/vote_button_component.rb

@@ -35,14 +35,14 @@ class Shared::VoteButtonComponent < ApplicationComponent
     end
 
     def vote
-      @vote ||= Vote.find_or_initialize_by(votable: votable, voter: current_user, vote_flag: parsed_value)
+      @vote ||= Vote.find_or_initialize_by(votable: votable, voter: current_user, vote_flag: in_favor?)
     end
 
     def already_voted?
       vote.persisted?
     end
 
-    def parsed_value
+    def in_favor?
       value == "yes"
     end
 end