Remove manual expiring of caches

All of the removed caches are using the model's cache key.
Because of that they get invalidated whenever the model gets
updated (the updated_at timestamp changes).

src/api/app/models/binary_release.rb

@@ -12,8 +12,6 @@ class SaveError < APIError; end
 
   #### Callbacks macros: before_save, after_save, etc.
   before_create :set_release_time
-  after_rollback :reset_cache
-  after_save :reset_cache
 
   #### Scopes (first the default_scope macro if is used)
 
@@ -211,10 +209,6 @@ def to_axml(_opts = {})
     Rails.cache.fetch("xml_binary_release_#{cache_key}") { render_xml }
   end
 
-  def reset_cache
-    Rails.cache.delete("xml_binary_release_#{cache_key}")
-  end
-
   def identical_to?(binary_hash)
     # handle nil/NULL case
     buildtime = binary_hash['buildtime'].blank? ? nil : Time.strptime(binary_hash['buildtime'].to_s, '%s')

src/api/app/models/bs_request.rb

@@ -361,16 +361,6 @@ def state
     self[:state].to_sym
   end
 
-  after_rollback :reset_cache
-  after_save :reset_cache
-
-  def reset_cache
-    return unless id
-    Rails.cache.delete("xml_bs_request_fullhistory_#{cache_key}")
-    Rails.cache.delete("xml_bs_request_history_#{cache_key}")
-    Rails.cache.delete("xml_bs_request_#{cache_key}")
-  end
-
   def to_axml(opts = {})
     if opts[:withfullhistory]
       Rails.cache.fetch("xml_bs_request_fullhistory_#{cache_key}") do
@@ -683,7 +673,6 @@ def approval_handling(new_approver, opts)
 
     self.approver = new_approver
     save!
-    reset_cache
   end
   private :approval_handling
 
@@ -819,7 +808,6 @@ def setpriority(opts)
 
     self.priority = opts[:priority]
     save!
-    reset_cache
 
     HistoryElement::RequestPriorityChange.create(p)
   end
@@ -939,7 +927,6 @@ def set_accept_at!(time = nil)
 
     self.accept_at = time || Time.now
     save!
-    reset_cache
   end
 
   def apply_default_reviewers