All content finder: Rename panel apply/clear buttons

These aren't necessarily just filters (i.e. can be sorting too), but
there isn't enough space and it would be faffy to change the text
dynamically based on what is selected.

This makes the button text more clear and concise.

app/views/components/_filter_panel.html.erb

@@ -55,14 +55,14 @@
 
     <div class="app-c-filter-panel__actions">
       <%= submit_tag(
-        "Apply filters",
+        "Apply",
         class: "govuk-button app-c-filter-panel__action app-c-filter-panel__action--submit",
         name: nil,
         data: {
           ga4_event: {
             event_name: "select_content",
             type: "finder",
-            text: "Apply filters",
+            text: "Apply",
             section: button_text,
             action: "search",
             index_section: 0,
@@ -73,7 +73,7 @@
 
       <% if show_reset_link %>
         <%= link_to(
-          "Clear all filters",
+          "Clear all",
           reset_link_href,
           class: "govuk-link govuk-link--no-visited-state app-c-filter-panel__action app-c-filter-panel__action--reset",
           data: {

features/step_definitions/site_search_steps.rb

@@ -84,7 +84,7 @@
 end
 
 When("I apply the filters") do
-  click_on "Apply filters"
+  click_on "Apply"
 end
 
 Then("I can see a filter section for every visible facet on the all content finder") do

spec/components/filter_panel_spec.rb

@@ -62,7 +62,7 @@ def render_component(locals, &block)
   it "renders the submit button" do
     render_component(button_text: "Filter")
 
-    assert_select ".app-c-filter-panel input.govuk-button.app-c-filter-panel__action.app-c-filter-panel__action--submit", value: "Apply filters"
+    assert_select ".app-c-filter-panel input.govuk-button.app-c-filter-panel__action.app-c-filter-panel__action--submit", value: "Apply"
   end
 
   it "doesn't render any buttons with a name attribute" do
@@ -74,7 +74,7 @@ def render_component(locals, &block)
   it "renders the reset link if the show_reset_link option is given" do
     render_component(button_text: "Filter", show_reset_link: true, reset_link_href: "/reset")
 
-    assert_select ".app-c-filter-panel a.govuk-link.govuk-link--no-visited-state.app-c-filter-panel__action.app-c-filter-panel__action--reset[href='/reset']", text: "Clear all filters"
+    assert_select ".app-c-filter-panel a.govuk-link.govuk-link--no-visited-state.app-c-filter-panel__action.app-c-filter-panel__action--reset[href='/reset']", text: "Clear all"
   end
 
   it "does not render the reset link if the show_reset_link option is not given" do
@@ -103,7 +103,7 @@ def render_component(locals, &block)
   end
 
   it "renders ga4 tracking attributes to submit button element" do
-    button_text = "Apply filters"
+    button_text = "Apply"
     section_count = 4
 
     button_event_attributes = {